[SLUG] Network

[Phil Scarratt]

To the network guru's out there

I am working at a school that is currently expanding. There are some new 
buildings being added to the campus (almost finished) that are now being 
wired. The question is what is the best way to wire to an existing 
network, considering the following:

1. The main existing building (call it the library) houses 3 network 
switches, along with 2 servers (firewall and other) and the adsl 
connection. In this building there is also 1 lab (15 machines) and 15 
library machines on the network. A few admin computers and links from 
staff rooms in other buildings also come here - nothing else major though.
2. The new building will house the lab (will be moved). Library machines 
will stay put. The lab being in the new building will mean that there 
will be fairly heavy traffic through to the library server.
3. ADSL connection is not likely to move.

I am thinking of mounting a secondary switch(s) in the new building, 
with an uplink to the existing network, however, what sort of uplink 
should it be:

1. Is it worth putting fibre in?
2. What does it take to make a gigabit network instead of 100Mbit?
3. Any other suggestions?
TIA
Fil
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[SLUG] Network sound

[Gerald]

Hi to one and all,
Since some machines have no sound systems in them. I would like to get
network sound working.
I am using PCLOS 2008/2009 and KDE 3.5.10
Your thoughts will be greatfully recived
Gerald

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[SLUG] Network Configuration

[Paresh]

Hello All,
I am new to LINUX. I have installed Red Hat Linux 
7.0. I want it to be on the network . But it is not coming. I used 'netcfg' to 
set my hostname and lo interface. that is working fine. but when I add eth0 
interface using 'netcfg' it is not activated. When I try to make it active 
it says "Delaying eth0 initialization". IFCONFIG  does not show me the 
eth0. it shows only lo. Any help is highly appreciated .
 
Thanks,
Paresh
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[SLUG] Network Testing

[Terry Collins]

Curiosity question.

everyone seems to be only using pings to test network connectivity.
what do people do when they need to test a service?
telnet IP PORT?

Thinking of cheops functionality.
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 "People without trees are like fish without clean water"
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[SLUG] network problem

[mick]

Hi everyone,

As briefly as possible.  I have smbfs mount directives in my /etc/fstab 
directory and they do work.  The mount points are under the /mnt directory.

The problem is that there is a LOOONNNGGG pause during the boot process, 
so long infact that I keep finding myself punching the [edit] key to 'help' 
it along.

it then says, mount success = 0 and then mounts two of the three points I have 
defined, as far as I can tell it varies in success with each mount...

Here's the added lines of my fstab ... editted.

/server/micellanous /mnt/micellanous smbfs defaults 0 0
/server/music  /mnt/music smbfs defualts 0 0
/server/programs /mnt/programs smbfs defaults 0 0

okay ... is there anyway to make this run in the background during the boot 
process so I can get rid od the Loonngg wait?  Is there anyway to get it 
mount all points all the time.

My server is an esmith 5.0 box with shared ibays.  Works well with windows 
hence the samba mounts.  I will try NFS mounts, but I don't know if that will 
work as there is no /etc/import/export entries on the server.


thanks 

Mick



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[SLUG] network problem

[mick]

Malcom said 

"Are you sure this isn't a DNS issue, the long pause caused by it trying
to resolve server? It could be an issue with your init scripts."

I don't know, I forgot to mention that I'm still relatively new to linux.  I'm 
using an esmith server, which is basically a preconfigured redhat 5.0/6.0 
server installation primarily for a small to medium WINDOWS network.  The 
esmith server manual I dutifully downloaded, printed, binded, labelled and 
read had lots of pretty windows config screen shots, nothing on linux.  

The two times I've gone in to "manually" configure something, I was given 
templates of everything with warnings not edit the template.  I stopped and 
left well enough alone.  I did create an /etc/export entry, but I doubt it's 
actually doing anything as I'm using smbfs to mount directories off the 
server.

The server provides DHCP (or is it DNS, I always get those mixed up) to the 
network of 1 iMac and 2 dual boot Windows XP/Redhat 7.3 machines. The server 
is spec'ed (according to esmith) for up to 40 users, so I doubt it's a 
hardware issue.  Eth0 comes up quickly during boot and my PC always get's an 
IP without any pause. I run a 100 base network.  

the directories don't require passwords to access, but maybe I should include 
passwds in /etc/fstab.  If that's the case, then is there a way I can "hide" 
the passwds?

Mick
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[SLUG] network problem

[mick]

Malcom asked

Which machine(s) are you trying to mount the samba shares from and which
machine(s) are you editing the /etc/fstab file on?

I'm mounting shares off the esmith server to my linux boxen.  I have rebooted 
my wife's machine three times and although she gets the long pause, if I hit 
enter once, hers says something about passwords and rockets through to the 
login, successfully loading all shares off the server?

I copied her fstab lines off my box.

I'll have a look around and see what I can find out about passwords

mick



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[SLUG] Network Chooser?

[Erik de Castro Lopo]

Hi all,

MacOSX has this little feature that allows you to have a couple of different 
network setups (ie home with static addres, work with dhcp etc) and choose
between them from the main menu. The only thing wrong with the MacOSX one
is that it doesn't seem to work properly however god the idea is.

Does Linux have anything similar. I had a look on freshmeat but couldn't
find anything.

Cheers,
Erik
-- 
+---+
  Erik de Castro Lopo  [EMAIL PROTECTED] (Yes it's valid)
+---+
"And MS thinks Linux is vulnerable to forking? 95, 95 OEM SR2, 98, 98SE, 
ME, NT, 2000, Bob, .NET, CE, Datacenter, Server, Adv. Server, and now 
Web Server, sheesh." -- BTS on LinuxToday.com
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[SLUG] Network Cards

[Edwin Humphries]

We're looking for someone (preferably a wholesaler) who can supply PCI-based 4-port 
hub network cards - not the type that allow bandwidth addition, but just a simple, 
cheap, on-board hub.

Does anyone know who can supply them?

Edwin Humphries,
Ironstone Technology Pty Ltd
[EMAIL PROTECTED]
www.ironstone.com.au
Phone: 02 4233 2285
Fax: 02 4233 2299
Mobile: 0419 233 051
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[SLUG] network considerations

[moise lim]

hi folks :)

i thought i'd ask for some advice on how to best approach this small problem 
of mine..

i have a smallish network of 30 computers which are currently on a Win2000 svr 
and sharing a windows-based dialup proxy for internet access.. there is also 
a windows-based mail server on the network.. very simple at the moment..

i m attempting to introduce linux into that environment becos i feel that this 
network will benefit from significant speed gains in improved web browsing, 
email services and also better security...

my current thoughts are :-

1/ leaving the workstations running windows - only for the time being though 
until i can convince users of the advantages of using a superior o/s in my 
following points
2/ leaving the win2000 svr alone but introducing a samba server and gradually 
migrating files across to samba until enuff load has been shedded on the 
win2000 svr
3/ introducing a linux-based mail svr to replace the windows based one
4/ introducing a linux-based proxy to replace the windows based one
5/ introducing a linux-based firewall to provide good security

as a relatively newcomer to linux.. i m curious to know what other folks are 
doing for smallish networks like my example...

are there other things i should be considering?? i don't think a dhcp svr is 
reuired only becos i go around setting static IPs...

thanks

moses
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Re: [SLUG] Network

[Oscar Plameras]

Campus computing? Think 'WIRELESS' now !

From: "Phil Scarratt" <[EMAIL PROTECTED]>
> To the network guru's out there
>
> I am working at a school that is currently expanding. There are some new
> buildings being added to the campus (almost finished) that are now being
> wired. The question is what is the best way to wire to an existing
> network, considering the following:
>
> 1. The main existing building (call it the library) houses 3 network
> switches, along with 2 servers (firewall and other) and the adsl
> connection. In this building there is also 1 lab (15 machines) and 15
> library machines on the network. A few admin computers and links from
> staff rooms in other buildings also come here - nothing else major though.
> 2. The new building will house the lab (will be moved). Library machines
> will stay put. The lab being in the new building will mean that there
> will be fairly heavy traffic through to the library server.
> 3. ADSL connection is not likely to move.
>
> I am thinking of mounting a secondary switch(s) in the new building,
> with an uplink to the existing network, however, what sort of uplink
> should it be:
>
> 1. Is it worth putting fibre in?
> 2. What does it take to make a gigabit network instead of 100Mbit?
> 3. Any other suggestions?
>
> TIA
> Fil
>
> --
> SLUG - Sydney Linux User's Group - http://slug.org.au/
> More Info: http://lists.slug.org.au/listinfo/slug
>

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RE: [SLUG] Network

[Dinesh]

Hi Phill,

Its probably best to have both, wireless access within campus and
buildings.  Since you would like to house a central server room, and
other network equipments, its probably best to go with the fibre between
buildings.  Fibre is always best for any backbones.  You can also
complement it with copper ofcourse.  Initial laying costs are much less
than later.  You can prolly make use of the Cisco 2950 series with the
sx modules in it, I dunno the model type.  This is probably best, unless
if you have budjet for getting a cisco 3500 series L3.  

I believe SMCs switches with fibres are as good these days.

Run Cat 6 for copper and 4 or 8 pair for the fibre.

Dinesh.


-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Oscar Plameras
Sent: Sunday, June 08, 2003 9:57 AM
To: Phil Scarratt; SLUG
Subject: Re: [SLUG] Network


Campus computing? Think 'WIRELESS' now !

From: "Phil Scarratt" <[EMAIL PROTECTED]>
> To the network guru's out there
>
> I am working at a school that is currently expanding. There are some
new
> buildings being added to the campus (almost finished) that are now
being
> wired. The question is what is the best way to wire to an existing
> network, considering the following:
>
> 1. The main existing building (call it the library) houses 3 network
> switches, along with 2 servers (firewall and other) and the adsl
> connection. In this building there is also 1 lab (15 machines) and 15
> library machines on the network. A few admin computers and links from
> staff rooms in other buildings also come here - nothing else major
though.
> 2. The new building will house the lab (will be moved). Library
machines
> will stay put. The lab being in the new building will mean that there
> will be fairly heavy traffic through to the library server.
> 3. ADSL connection is not likely to move.
>
> I am thinking of mounting a secondary switch(s) in the new building,
> with an uplink to the existing network, however, what sort of uplink
> should it be:
>
> 1. Is it worth putting fibre in?
> 2. What does it take to make a gigabit network instead of 100Mbit?
> 3. Any other suggestions?
>
> TIA
> Fil
>
> --
> SLUG - Sydney Linux User's Group - http://slug.org.au/
> More Info: http://lists.slug.org.au/listinfo/slug
>

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RE: [SLUG] Network

[Adam W]

> I am thinking of mounting a secondary switch(s) in the new building, 
> with an uplink to the existing network, however, what sort of uplink 
> should it be:


Yes, this would be the most appropriate - I wouldn't be running 15 cat5
cables out to the new building!!

> 1. Is it worth putting fibre in?
> 2. What does it take to make a gigabit network instead of 
> 100Mbit? 3. Any other suggestions?

Fibre (correct me if I'm wrong anyone!!) wont give you better speeds as
such - unless of course your comparing gigabit fibre to 10/100 copper.
The main use for fibre is for distance communications. You see cat5 can
only go approx 100m (probably less) without losing the signal
completely... Where as fibre can reach far greater distances (I wont try
give an estimate) but its way more than copper.

So depending on how far this building is away from the other, and the
cable run, will determine the sort of link you should get.

Don't ask me about a gigabit uplink :)

Cheers,

Adam W.

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Re: [SLUG] Network

[Robert Tillsley <[EMAIL PROTECTED]>]

> I am thinking of mounting a secondary switch(s) in the new building,
> with an uplink to the existing network, however, what sort of uplink
> should it be:
>
> 1. Is it worth putting fibre in?

Putting Fibre between separate buildings is something that I think is a must. 
As I understand it, it provides some electrical separation between computers 
in different buildings which can be pretty important in cases of lightening 
strikes etc.

Bare in mind the cost of any trenching required, and how hard the buildings 
are to work in. (this covers any type of cable of course). Modern buildings 
can be easier to work with.

I also think its worth paying close attention to detail such as finishing, 
making sure that in wall cavities that the cable isn't stressed and if its 
layed across any ceiling expanse that its suspended on wire. And 
cosmetically, consider how the cable is going to enter the building, the 
amount of hideous looking jobs that for an extra hour of time could have 
looked so much nicer.

> 2. What does it take to make a gigabit network instead of 100Mbit?

Depending on what switches you use, you may either need new switches or if you 
have modular switches you'll need gigabit adapters. You'll need the fibre 
layed (usually the more cores you can afford the better. It provides you with 
redundancy and room for future expansion). Modern switches and patches us SC 
(2x rectangular ends) as apposed to ST (2x a bit like old coax).

1GB cards are usually quite a bit more expensive and often have less ports 
than 100mb cards.

There are also different types of cable for different distances. For the life 
of me, I can't remember their names right now (sick on a long weekend, 
bugger!) Multi-mode is one. 

I usually prefer 1 GB connectors between buildings, but consider the sort of 
data that is going to be accessed. If its a lot of web browsing then you may 
find 100MB doesn't get saturated at all.

Also no matter what, make sure your switches have the backplane speed to 
handle the maximum amount of data that the cards can put through it. Nothing 
like having GB connections limited by a switch.

I hope that made some sense.

Cheers

Rob T
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Re: [SLUG] Network

[Jon Teh]

On Sun, Jun 08, 2003 at 02:42:57PM +1000, Robert Tillsley <[EMAIL PROTECTED]> wrote:
> 
> > I am thinking of mounting a secondary switch(s) in the new building,
> > with an uplink to the existing network, however, what sort of uplink
> > should it be:
> >
> > 1. Is it worth putting fibre in?
> 
> Putting Fibre between separate buildings is something that I think is a must. 
> As I understand it, it provides some electrical separation between computers 
> in different buildings which can be pretty important in cases of lightening 
> strikes etc.

This is correct, fibre runs between buildings prevent fault currents from
faulty equipment, and induced or direct lightning strike transmission between
buildings.

> 
> Bare in mind the cost of any trenching required, and how hard the buildings 
> are to work in. (this covers any type of cable of course). Modern buildings 
> can be easier to work with.
> 

If you are paying someone else to lay the cables (most likely in this situation)
 make sure they are data cablers who know what they are doing.

I've seen quite a few shonky jobs out there when an electrician thought doing
network cabling without any form of training or practice would be a good idea
(think cables terminated into Krone punch downs in any old order, matching pins
at each side, but not following colour codes printed on the little labels,
causing failure due to the twisted pairs being incorrectly used.

> I also think its worth paying close attention to detail such as finishing, 
> making sure that in wall cavities that the cable isn't stressed and if its 
> layed across any ceiling expanse that its suspended on wire. And 
> cosmetically, consider how the cable is going to enter the building, the 
> amount of hideous looking jobs that for an extra hour of time could have 
> looked so much nicer.
> 
> > 2. What does it take to make a gigabit network instead of 100Mbit?
> 
> Depending on what switches you use, you may either need new switches or if you
> have modular switches you'll need gigabit adapters. You'll need the fibre 
> layed (usually the more cores you can afford the better. It provides you with 
> redundancy and room for future expansion). Modern switches and patches us SC 
> (2x rectangular ends) as apposed to ST (2x a bit like old coax).
> 
> 1GB cards are usually quite a bit more expensive and often have less ports 
> than 100mb cards.
>

Don't forget that 1Gb copper is also available, which is quite economical for
things like servers, as the NICs for it are now under $100 for some brands.
Gigabit copper requires that the cables be either good Cat 5 or Cat 5e and up,
but this shouldn't be a problem, as all reputable cablers lay a minimum of Cat
5e for networks these days. Another thing to keep in mind is that Gigabit
copper uses all 4 pairs of the cable.
 
> There are also different types of cable for different distances. For the life 
> of me, I can't remember their names right now (sick on a long weekend, 
> bugger!) Multi-mode is one. 
> 

In terms of basic major fibre categories, the scale of most to least attenuation
and dispersion, it goes something like this:

* Multimode Step Index (SI) - Cheap, widely used in LANs.
* Multimode Graded Index (GI)
* Single Mode (SM) - Good, widely used in telecommunications.

Note there are quite a few other variants of fibre out there, but they are not
relevant to basic LANs, and would be more a concern on DWDM systems.



-- jon Teh 
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Re: [SLUG] Network

[Robert Tillsley <[EMAIL PROTECTED]>]

> This is correct, fibre runs between buildings prevent fault currents from
> faulty equipment, and induced or direct lightning strike transmission
> between buildings.

I've heard of some nasty incidents, though I've never been involved.

> If you are paying someone else to lay the cables (most likely in this
> situation) make sure they are data cablers who know what they are doing.
> I've seen quite a few shonky jobs out there when an electrician thought
> doing network cabling without any form of training or practice would be a
> good idea (think cables terminated into Krone punch downs in any old order,
> matching pins at each side, but not following colour codes printed on the
> little labels, causing failure due to the twisted pairs being incorrectly
> used.

I think its worth spending serious dollars on good testing equipment like 
Fluke's.

> Don't forget that 1Gb copper is also available, which is quite economical
> for things like servers, as the NICs for it are now under $100 for some
> brands. Gigabit copper requires that the cables be either good Cat 5 or Cat
> 5e and up, but this shouldn't be a problem, as all reputable cablers lay a
> minimum of Cat 5e for networks these days. Another thing to keep in mind is
> that Gigabit copper uses all 4 pairs of the cable.

I must admit I've not dealt with Gb copper. I use cat5e for all copper anyway, 
including standard patch cables. Its not much expensive.
Have you used Gb copper much? I'd be interested in your views of it. I've 
heard that its pretty sensitive to cable flexing. 

Cheers

Rob T

> * Multimode Step Index (SI) - Cheap, widely used in LANs.
> * Multimode Graded Index (GI)
> * Single Mode (SM) - Good, widely used in telecommunications.
>
> Note there are quite a few other variants of fibre out there, but they are
> not relevant to basic LANs, and would be more a concern on DWDM systems.


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Re: [SLUG] Network

[Kevin Saenz]

Hopefully encrypted there is an organisation in Western Sydney
that uses wireless networking without encryption. They are a
distribution centre. Would hate to see someone get to their
databases and screw up their inventory.


> Campus computing? Think 'WIRELESS' now !
> 
> From: "Phil Scarratt" <[EMAIL PROTECTED]>
> > To the network guru's out there
> >
> > I am working at a school that is currently expanding. There are some new
> > buildings being added to the campus (almost finished) that are now being
> > wired. The question is what is the best way to wire to an existing
> > network, considering the following:
> >
> > 1. The main existing building (call it the library) houses 3 network
> > switches, along with 2 servers (firewall and other) and the adsl
> > connection. In this building there is also 1 lab (15 machines) and 15
> > library machines on the network. A few admin computers and links from
> > staff rooms in other buildings also come here - nothing else major though.
> > 2. The new building will house the lab (will be moved). Library machines
> > will stay put. The lab being in the new building will mean that there
> > will be fairly heavy traffic through to the library server.
> > 3. ADSL connection is not likely to move.
> >
> > I am thinking of mounting a secondary switch(s) in the new building,
> > with an uplink to the existing network, however, what sort of uplink
> > should it be:
> >
> > 1. Is it worth putting fibre in?
> > 2. What does it take to make a gigabit network instead of 100Mbit?
> > 3. Any other suggestions?
> >
> > TIA
> > Fil
> >
> > --
> > SLUG - Sydney Linux User's Group - http://slug.org.au/
> > More Info: http://lists.slug.org.au/listinfo/slug
> >

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Re: [SLUG] Network

[Oscar Plameras]

> Hopefully encrypted there is an organisation in Western Sydney
> that uses wireless networking without encryption. They are a
> distribution centre. Would hate to see someone get to their
> databases and screw up their inventory.
> 
> 

I would  use Public Networks like the Internet on a secured line only.

This is always assumed. 'Trust no one' is my rule on Public Networks.


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Re: [SLUG] Network

[Heracles]

On Sunday 08 Jun 2003 11:20 am, Phil Scarratt wrote:
> To the network guru's out there
>
> I am working at a school that is currently expanding. There are
> some new buildings being added to the campus (almost finished)
> that are now being wired. The question is what is the best way
> to wire to an existing network, considering the following:

If your school is a Dept of Education (State) School you will find 
that there are specific standards that you must comply with. 
New buildings will be wired to these standards and they should 
also be connected to the MDF, which is either near the main 
router or in the library, by the contractor as part of their 
contract.  Between building is usually fibre and cat5e cable is 
used within. You can choose slower switches, but Gigabit seems to 
be the most common choice in schools at the moment.

Stay well and happy
Heracles

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Re: [SLUG] Network

[Phil Scarratt]

Thanks to all who responded. I was aware of the distance limit of 5e but 
wanted to know if there was any other reason why fibre would be better. 
I am enlightened

Thanks a million
fil
Jon Teh wrote:
On Sun, Jun 08, 2003 at 02:42:57PM +1000, Robert Tillsley <[EMAIL PROTECTED]> wrote:

I am thinking of mounting a secondary switch(s) in the new building,
with an uplink to the existing network, however, what sort of uplink
should it be:
1. Is it worth putting fibre in?
Putting Fibre between separate buildings is something that I think is a must. 
As I understand it, it provides some electrical separation between computers 
in different buildings which can be pretty important in cases of lightening 
strikes etc.


This is correct, fibre runs between buildings prevent fault currents from
faulty equipment, and induced or direct lightning strike transmission between
buildings.

Bare in mind the cost of any trenching required, and how hard the buildings 
are to work in. (this covers any type of cable of course). Modern buildings 
can be easier to work with.



If you are paying someone else to lay the cables (most likely in this situation)
 make sure they are data cablers who know what they are doing.
I've seen quite a few shonky jobs out there when an electrician thought doing
network cabling without any form of training or practice would be a good idea
(think cables terminated into Krone punch downs in any old order, matching pins
at each side, but not following colour codes printed on the little labels,
causing failure due to the twisted pairs being incorrectly used.

I also think its worth paying close attention to detail such as finishing, 
making sure that in wall cavities that the cable isn't stressed and if its 
layed across any ceiling expanse that its suspended on wire. And 
cosmetically, consider how the cable is going to enter the building, the 
amount of hideous looking jobs that for an extra hour of time could have 
looked so much nicer.


2. What does it take to make a gigabit network instead of 100Mbit?
Depending on what switches you use, you may either need new switches or if you
have modular switches you'll need gigabit adapters. You'll need the fibre 
layed (usually the more cores you can afford the better. It provides you with 
redundancy and room for future expansion). Modern switches and patches us SC 
(2x rectangular ends) as apposed to ST (2x a bit like old coax).

1GB cards are usually quite a bit more expensive and often have less ports 
than 100mb cards.



Don't forget that 1Gb copper is also available, which is quite economical for
things like servers, as the NICs for it are now under $100 for some brands.
Gigabit copper requires that the cables be either good Cat 5 or Cat 5e and up,
but this shouldn't be a problem, as all reputable cablers lay a minimum of Cat
5e for networks these days. Another thing to keep in mind is that Gigabit
copper uses all 4 pairs of the cable.
 

There are also different types of cable for different distances. For the life 
of me, I can't remember their names right now (sick on a long weekend, 
bugger!) Multi-mode is one. 



In terms of basic major fibre categories, the scale of most to least attenuation
and dispersion, it goes something like this:
* Multimode Step Index (SI) - Cheap, widely used in LANs.
* Multimode Graded Index (GI)
* Single Mode (SM) - Good, widely used in telecommunications.
Note there are quite a few other variants of fibre out there, but they are not
relevant to basic LANs, and would be more a concern on DWDM systems.


-- jon Teh 


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[SLUG] Network Problem

[El 4Love]

Hello All,

I have encountered a problem with our network.
Following is diagrams shows how our computers are connected.

Internet
|
|
ADSL Router/Firewall
|
|
   | |  
Switch  Workstation1  
   | 
 __|___ 
|  |   
Other Workstations   Linux Server

The problem with our network is that, it stops functioning after about a
day or so, and then I have to restart the router and switch (switch-off
and switch-on) to resume normal operations. The linux server runs a web
server, and when this happens the browser from the external computer
says, network unreachable. I won't even be able to ping any of the
machines from any other machine in the network. I use all private IP
addresses for all the machines.

Can anyone suggest where to look for?

~mahen

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[SLUG] Network Monitor

[Carlo Nizeti]

hello all

I'm after a program for X that will show graphically the status of my linux
gateway. Specifically how many K are going through each Ethernet card and
how many megs have been done through each Ethernet card. Sorta like the
Microsoft (gasp!) system monitor.

Carlo
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[SLUG] Network authentication

[James Wilkinson]

I need to upgrade the old auth mechanism at work, because it's
hella-broken (syncing passwd files across machines), and it's come back
to bite me today, so I really want to do soemthing like NIS, only not
NIS.

I'm thinking authentication using either LDAP or Kerberos, so I'd like
comments and tips from anyone who's used either of these services.

Oh, and the server is a Debian potato machine, so relevant packages would
be useful, too.

-- 
 * dpkg ponders: 'C++' should have been called 'D'
(o_ '   -- #Debian
//\  
v_/_


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[SLUG] network monitoring

[Adam Hewitt]

Hi,

is there a 'standard' tool for network monitoring, ie. who's connected, 
what the speed is on the ISP connection, who is pulling traffic and how 
much, load, etc. If there isn't a standard one could someone give me some 
ideas about some good utils??

Cheers,

Adam.


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[SLUG] network newbie

[Nick Croft]

I have `old_box' with a dialup ISP which I'm still using for mail etc, 
and `new_box' onto which I'm slowly ftp-ing what I want to keep.

Naive question is, what sort of configuration I need to do to connect 
new_box to the net? Would it involve route -add host gw ?

new_box is 172.16.4.1
old_box is 172.16.4.2

Would it go like:

/sbin/route add -host ISPnumber gw 172.16.4.2

and would I have to change this each time I dialup depending on the 
remote address I get from the ISP ?

I don't want to blow anythin up, which is why I'm asking first. 

Thankyou,

Nick




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[SLUG] network gateway

[Greg Gailer]

Greetings All
I have a home network that I want to set up to dial the net on demand, but I
would like a separate computer to
do the dialling and monitoring with the snort NIDS program. The way I would
like to do it is as follows:

Home Network --- eth0[server computer]eth1 --- eth0[dialling
computer]ppp0 --- Internet

I have set up diald on the dialling computer and it seems to work well. How
do I go about setting up
both computers so that any computer on the home network can dial the
Internet? Is it best to have a
whole separate subnet address for the dialling computer or the same as the
home network? How do I
configure the routing and gateways? I know this is an involved question but
I haven't found any texts
that help a great deal. I look forward to any responses.

Greg Gailer
[EMAIL PROTECTED]






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[SLUG] network options

[kiran babu]

hello,
this is kiran.  i want to know whether there 
is any equivalent command in linux for 'no' command in SUN operating system 
seeing the network options.  using which we can see and set the 
options.  the main issue is this.
In setsockopt one option is SO_KEEPALIVE.  
using which server in general probes the client is alive or not upto 
2hours.  This time has most probably to be set in network 
options.  How to see all such parameters in Linux.
 
And one more issue how to see the kernel 
configuration values in runtime.  suppose i want to know how many processes 
i can open at  a time in my linux machine.  how can i get this 
information.  in sysctl it is not there.
 
this is very important for me.  please reply 
me as soon as possible.
bye
kiran

Re: [SLUG] Network sound

[Dean Hamstead]

ages ago i experimented with getting esound working over a network.

my experiment was successful and having achieved my goal i did nothing 
more with it.


but i had a quirky combination of softwares and hardware...

xmms running on a clamshell ibook running debian pcc via wireless 
ethernet playing onto freebsd for intel, via an aureal vortex sound card.


the vintage of the hardware reinforces how ages ago was.
and yes it seemed to work fine. so feeling satisfied by my achievement i 
never did anything more with it.


esound is way old.

kde uses jack, and netjack can play over a network. pulseaudio seems to 
also.



Dean

Gerald wrote:

Hi to one and all,
Since some machines have no sound systems in them. I would like to get
network sound working.
I am using PCLOS 2008/2009 and KDE 3.5.10
Your thoughts will be greatfully recived
Gerald


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Re: [SLUG] Network sound

[Erik de Castro Lopo]

Gerald wrote:

> Since some machines have no sound systems in them. I would like to get
> network sound working.
> I am using PCLOS 2008/2009 and KDE 3.5.10
> Your thoughts will be greatfully recived

I'm not sure if KDE uses PulseAudio, but I do know that PA can
do this out of the box on Gnome based systems.

Erol
-- 
-
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-
"... so the notion that it is meaningful to pass pointers to memory
objects into which any random function may write random values
without having a clue where they point, has _not_ been debunked as
the sheer idiocy it really is." -- Erik Naggum, comp.lang.lisp
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Re: [SLUG] Network sound

[Daniel Pittman]

Erik de Castro Lopo  writes:
> Gerald wrote:
>
>> Since some machines have no sound systems in them. I would like to
>> get network sound working.  I am using PCLOS 2008/2009 and KDE 3.5.10
>> Your thoughts will be greatfully recived
>
> I'm not sure if KDE uses PulseAudio, but I do know that PA can
> do this out of the box on Gnome based systems.

KDE 3 doesn't, directly, but the arts system it uses can be configured
with an esd backend, and PA can emulate that.

For network sound I would suggest PulseAudio, which isn't absolutely
trivial to get working, but does a very good job of integrating zeroconf
via avahi to allow you to get the network side zero-configuration.

Their wiki has a good reference to integrating PulseAudio:
http://www.pulseaudio.org/wiki/PerfectSetup

Also, I have no idea what PCLOS is based on, so comment on how
effectively it works with PA, or vice-versa.

Regards,
Daniel
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[SLUG] network manager files

[david]

I'm trying to debug a networkmanager problem. I've found this xml file:

~/.gconf/system/networking/connections/1/ipv4/%gconf.xml

Can anyone help with interpreting the address values? I'm especially curious 
about the negative one :-)


thanks...

David.





kenpro.com.au

















manual


ipv4


ipv4/\%gconf.xml (END)
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Re: [SLUG] Network Configuration

[tone]

have you tried the manual way.. eg 

$ ifconfig eth0 192.168.0.20 netmask 255.255.255.0

either that, or in debian, maybe red hat, 

$ ifup eth0

On Sun, 2003-09-21 at 08:20, Paresh wrote:
> Hello All,
> I am new to LINUX. I have installed Red Hat Linux 7.0. I want it to be
> on the network . But it is not coming. I used 'netcfg' to set my
> hostname and lo interface. that is working fine. but when I add eth0
> interface using 'netcfg' it is not activated. When I try to make it
> active it says "Delaying eth0 initialization". IFCONFIG  does not show
> me the eth0. it shows only lo. Any help is highly appreciated .
>  
> Thanks,
> Paresh
> 
> __
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Re: [SLUG] Network Configuration

[Grant Parnell]

On Sat, 20 Sep 2003, Paresh wrote:

> Hello All,

> I am new to LINUX. I have installed Red Hat Linux 7.0. I want it to be
> on the network . But it is not coming. I used 'netcfg' to set my
> hostname and lo interface. that is working fine. but when I add eth0
> interface using 'netcfg' it is not activated. When I try to make it
> active it says "Delaying eth0 initialization". IFCONFIG does not show me
> the eth0. it shows only lo. Any help is highly appreciated .

The phrase "Delaying eth0 initialization" probably comes up during a 
bootup right? This is probably because the 'module' software driver for 
the network card has not been loaded at that stage of the bootup process 
OR for example it's a PCMCIA card in a laptop and the PCMCIA service 
hasn't been started yet.

Please perhaps indicate what type of network card it is, do a google 
search on the model of the card for example 'Etherexpress linux'. When you 
find out which module it is ensure it's mentioned in /etc/conf.modules.
Manually you can do 'modprobe '

But perhaps the best advice by far would be to see if you can get a later 
version of RedHat. 7.0 is very very old now, they've gone through 7.1, 
7.2, 7.3, 8.0, and currently up to 9. (not 9.0). Configuration is 
generally easier and more automatic now.

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[SLUG] Network Mapping tool

[Peter Rundle]

Sluggers,

I'm looking for a tool like Cheops that will trace out my network and draw a pretty 
picture of the nodes, their OSes and the services they are running etc.

I tried to download and compile Cheops but it's not being maintained and the number of 
compile errors looks like a hard road.

Any suggestions for alternatives?

P.
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[SLUG] network sound daemons

[Dean Hamstead]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
can anyone recommend a good network sound daemon?
ive had a play with esound but havent had much sucess
when going over a network. by much i mean any. just
doesnt seem to work.
im looking at jack.

does anyone have any experience that could recommend
something?
im just basically looking to play audio on my desktop
but have it go through the network and out another machine
basically i tried pointing esound clients to another
machine running esd with tcp supposedly running.
Dean
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Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org
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Re: [SLUG] Network Testing

[Anth]

On Tue, 17 Aug 2004, Terry Collins wrote:

> Curiosity question.
> 
> everyone seems to be only using pings to test network connectivity.
> what do people do when they need to test a service?
> telnet IP PORT?

nagios. http://www.nagios.org

cheers,
Anth


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Re: [SLUG] Network Testing

[Ken Foskey]

On Tue, 2004-08-17 at 22:05, Terry Collins wrote:
> Curiosity question.
> 
> everyone seems to be only using pings to test network connectivity.
> what do people do when they need to test a service?

ping and traceroute only work when commercial setups allow them to
work.  These are not reliable.

> telnet IP PORT?

Absolutely.  Unfortunately we have smart firewalls at work now and you
have to follow the protocol correctly or the firewall will reject you
connection, how do you know?

It continues to surprise me how many people cannot work this out. " I
pinged the computer and it was down" is no longer a correct problem
determination, the ping is probably deliberately blocked.

-- 
Thanks
KenF
OpenOffice.org developer

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Re: [SLUG] Network Testing

[Matthew Palmer]

On Tue, Aug 17, 2004 at 10:05:59PM +1000, Terry Collins wrote:
> Curiosity question.
> 
> everyone seems to be only using pings to test network connectivity.
> what do people do when they need to test a service?
> telnet IP PORT?

I use netcat for random little bits and pieces.

- Matt


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Re: [SLUG] Network Testing

[Jamie Wilkinson]

This one time, at band camp, Terry Collins wrote:
>Curiosity question.
>
>everyone seems to be only using pings to test network connectivity.
>what do people do when they need to test a service?
>telnet IP PORT?

or netcat, 

or if you're monitoring hosts and services regularly, nagios.

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Re: [SLUG] Network Testing

[Peter Hardy]

On 08/17/04 22:43, Jamie Wilkinson wrote:
This one time, at band camp, Terry Collins wrote:
Curiosity question.
everyone seems to be only using pings to test network connectivity.
what do people do when they need to test a service?
telnet IP PORT?

or netcat, 

or if you're monitoring hosts and services regularly, nagios.
Even if you're not, the nagios plugins that do the actual checking are 
regular programs that you can execute from the commandline. They're very 
useful for doing application-layer checks. For eg, the check_http plugin 
will connect to port 80 and do a basic request (I don't remember if it's 
a GET / or a HEAD, or something else entirely though).

--
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RE: [SLUG] Network Testing

[Visser, Martin]

I know it might seem to be a sledgehammer to crack a nut, but Nagios is
a good service oriented monitoring tool that is OSS. 

BTW Most load-balancing devices that need to do service monitoring
simply open the service port and try to get a basic response that proves
that the service is up and operating. For instance for a web service
with a DB backend you might first do a simple HTTP GET of a static page
(and compare with a known result) and then do a simple DB query via the
web service to make sure the DB is running. Clearly some sort of
algorithm needs to be determined of when to declare a service "down"
(and when to declare it available again).

(Of course if you want a slightly bigger sledgehammer there is HP
OpenView (though not OSS) )

Martin Visser ,CISSP
Network and Security Consultant 
Consulting & Integration
Technology Solutions Group - HP Services

3 Richardson Place 
North Ryde, Sydney NSW 2113, Australia 

Phone: +61-2-9022-1670
Mobile: +61-411-254-513
Fax: +61-2-9022-1800 
E-mail: martin.visserAThp.com
 
 

> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of Terry Collins
> Sent: Tuesday, 17 August 2004 10:06 PM
> To: Slug List
> Subject: [SLUG] Network Testing
> 
> Curiosity question.
> 
> everyone seems to be only using pings to test network connectivity.
> what do people do when they need to test a service?
> telnet IP PORT?
> 
> Thinking of cheops functionality.
> -- 
>Terry Collins {:-)}}} email: terryc at woa.com.au  www:
> http://www.woa.com.au  
>Wombat Outdoor Adventures  Publishing>
> 
>  "People without trees are like fish without clean water"
> --
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> http://slug.org.au/ Subscription info and FAQs: 
> http://slug.org.au/faq/mailinglists.html
> 
> 
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RE: [SLUG] Network Testing

[David]

On Wed, 18 Aug 2004, Visser, Martin wrote:

> I know it might seem to be a sledgehammer to crack a nut, but Nagios is
> a good service oriented monitoring tool that is OSS.

I've taken a quick look at this, but *for my purposes* I can't see it's
an improvement on just pinging.

Problem:
I've changed providors, and suddenly I'm getting outages that THEY can't
explain. We all suspect routing issues upstream, but no one seems to be
able to put a finger on it.

My current solution:
Run a script once per minute which pings Powertel's border gateway
(border-gw015-ge02.powertel.net.au) and emails me if two consecutive pings
fail.

Result:
Averaging one failure/hour.. sometimes several consecutively.

Question: Is it reasonable to expect  to be a true indication
of the network status? I understand that ping waits one second before
giving an error. That sounds like a network problem to me. The "normal"
ping is about 7 ms. I ran this same script for 3 years with my previous
providor (optus) and it only complained on the rare occasions that there
was a genuine, serious problem.

BTW: Nagios looks terrific, but I have complete control of the various
services so they are less of a problem for me. It's the network status
that's giving me grief. As far as I can tell, to prove the network is up
Nagios basically does something similar to what I'm already doing.


David.


>
> BTW Most load-balancing devices that need to do service monitoring
> simply open the service port and try to get a basic response that proves
> that the service is up and operating. For instance for a web service
> with a DB backend you might first do a simple HTTP GET of a static page
> (and compare with a known result) and then do a simple DB query via the
> web service to make sure the DB is running. Clearly some sort of
> algorithm needs to be determined of when to declare a service "down"
> (and when to declare it available again).
>
> (Of course if you want a slightly bigger sledgehammer there is HP
> OpenView (though not OSS) )
>
> Martin Visser ,CISSP
> Network and Security Consultant
> Consulting & Integration
> Technology Solutions Group - HP Services
>
> 3 Richardson Place
> North Ryde, Sydney NSW 2113, Australia
>
> Phone: +61-2-9022-1670
> Mobile: +61-411-254-513
> Fax: +61-2-9022-1800
> E-mail: martin.visserAThp.com
>
>
>
> > -Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On Behalf Of Terry Collins
> > Sent: Tuesday, 17 August 2004 10:06 PM
> > To: Slug List
> > Subject: [SLUG] Network Testing
> >
> > Curiosity question.
> >
> > everyone seems to be only using pings to test network connectivity.
> > what do people do when they need to test a service?
> > telnet IP PORT?
> >
> > Thinking of cheops functionality.
> > --
> >Terry Collins {:-)}}} email: terryc at woa.com.au  www:
> > http://www.woa.com.au
> >Wombat Outdoor Adventures  > Publishing>
> >
> >  "People without trees are like fish without clean water"
> > --
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> > http://slug.org.au/ Subscription info and FAQs:
> > http://slug.org.au/faq/mailinglists.html
> >
> >
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Re: [SLUG] Network Testing

[Dave Kempe]

David wrote:
Result:
Averaging one failure/hour.. sometimes several consecutively.
Question: Is it reasonable to expect  to be a true indication
of the network status? I understand that ping waits one second before
giving an error. That sounds like a network problem to me. The "normal"
ping is about 7 ms. I ran this same script for 3 years with my previous
providor (optus) and it only complained on the rare occasions that there
was a genuine, serious problem.
 

I have seen the same result on request DSL. The customer didn't seem to 
mind so I didn't pursue it.
Other request DSL customers haven't had the same result.
You wouldn't happen to be in the south of sydney would you (around 
hurstville?)

dave
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Re: [SLUG] Network Testing

[James Gray]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

On Wed, 18 Aug 2004 11:27 am, Dave Kempe wrote:
> David wrote:
> >Result:
> >Averaging one failure/hour.. sometimes several consecutively.
> >

**SNIP**

> I have seen the same result on request DSL. The customer didn't seem to
> mind so I didn't pursue it.
> Other request DSL customers haven't had the same result.
> You wouldn't happen to be in the south of sydney would you (around
> hurstville?)
>
> dave

FWIW we've been using RequestDSL in our Sydney CBD office for about 2.5 
years now and never had a major outage (2 outages totalling 35min of down 
time in 2.5 years).  Our serice is provided of SHDSL if that helps (2x2Mbps 
load balanced).  IIRC RequestDSL actually DEPRIORITISE ICMP Ping and ICMP 
Time Exceed (ping/traceroute).  Consequently we often have ping monitors 
show an error whereas the TCP service monitor to the same server is fine 
and dandy.  Maybe follow up with the ISP and see if they are doing any 
traffic shaping on ICMP?  Heheh - maybe they're using WinXP-SP2 for 
routers :P

James
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RE: [SLUG] Network Testing

[Visser, Martin]

One thing about pinging a providers gateway is that for the router to
respond to the ping requires it's management functions to actually
process this request. Usually such functions are quite low in the
priority list (the routers primary function is to forward packets to the
destination by the optimal path, and not respond to ICMP requests). 

Also a single ping is a single IP packet. IP is by nature unreliable in
that instantaneous congestion, link failovers, etc will cause individual
IP packets to be lost. This is why you need protocols such as TCP to
provide reliable transport on top of IP. Thus loss of a single packet
does not significantly affect performance for most apps. (Loss of many
packets of course will). For instance when I have investigated networks
for issues supporting Voice over IP I have sent regular small bursts
(say 10 pings over 1 seconds at 15 second intervals) to understand if
there are is major issue with the network having burst losses. While an
individual packet loss is not likely to affect an app at all, a burst
loss often will. (VoIP is of course very sensitive to packet loss as
there is no recovery mechanism other than playing silence).

My suggestion if you are concerned that your ISP is not maintaining a
good level of service, rather than ping their gateways I would do HTTP
GETs to 3 or 4 major web sites. Pick say one hosted by your ISP, one or
two local to Oz and one or two that are international, and are going to
pretty well always be available. If you measure the response time to get
a small static file (say a GIF) you can then get a feeling of the
performance level through your ISP and their connection to the internet.
You of course need to figure how to interpret response times across the
different servers. This way you are not (falsely) interpreting a one or
two ICMP losses from a router as failure. 

Anyway just a few thoughts for discussion.

Martin Visser ,CISSP
Network and Security Consultant 
Consulting & Integration
Technology Solutions Group - HP Services

3 Richardson Place 
North Ryde, Sydney NSW 2113, Australia 

Phone: +61-2-9022-1670
Mobile: +61-411-254-513
Fax: +61-2-9022-1800 
E-mail: martin.visserAThp.com
 
 

> -Original Message-
> From: David [mailto:[EMAIL PROTECTED] 
> Sent: Wednesday, 18 August 2004 10:10 AM
> To: Visser, Martin
> Cc: Slug List
> Subject: RE: [SLUG] Network Testing
> 
> 
> 
> On Wed, 18 Aug 2004, Visser, Martin wrote:
> 
> > I know it might seem to be a sledgehammer to crack a nut, 
> but Nagios 
> > is a good service oriented monitoring tool that is OSS.
> 
> I've taken a quick look at this, but *for my purposes* I 
> can't see it's an improvement on just pinging.
> 
> Problem:
> I've changed providors, and suddenly I'm getting outages that 
> THEY can't explain. We all suspect routing issues upstream, 
> but no one seems to be able to put a finger on it.
> 
> My current solution:
> Run a script once per minute which pings Powertel's border gateway
> (border-gw015-ge02.powertel.net.au) and emails me if two 
> consecutive pings fail.
> 
> Result:
> Averaging one failure/hour.. sometimes several consecutively.
> 
> Question: Is it reasonable to expect  to be a true 
> indication of the network status? I understand that ping 
> waits one second before giving an error. That sounds like a 
> network problem to me. The "normal"
> ping is about 7 ms. I ran this same script for 3 years with 
> my previous providor (optus) and it only complained on the 
> rare occasions that there was a genuine, serious problem.
> 
> BTW: Nagios looks terrific, but I have complete control of 
> the various services so they are less of a problem for me. 
> It's the network status that's giving me grief. As far as I 
> can tell, to prove the network is up Nagios basically does 
> something similar to what I'm already doing.
> 
> 
> David.
> 
> 
> >
> > BTW Most load-balancing devices that need to do service monitoring 
> > simply open the service port and try to get a basic response that 
> > proves that the service is up and operating. For instance for a web 
> > service with a DB backend you might first do a simple HTTP GET of a 
> > static page (and compare with a known result) and then do a 
> simple DB 
> > query via the web service to make sure the DB is running. 
> Clearly some 
> > sort of algorithm needs to be determined of when to declare 
> a service "down"
> > (and when to declare it available again).
> >
> > (Of course if you want a slightly bigger sledgehammer there is HP 
> > OpenView (though not OSS) )
> >
> > Martin Visser ,CISSP
> > Network and Security Consultant
> > Consulting &

Re: [SLUG] Network Testing

[DaZZa]

On Tue, 17 Aug 2004, Terry Collins wrote:

> Curiosity question.
>
> everyone seems to be only using pings to test network connectivity.
> what do people do when they need to test a service?
> telnet IP PORT?
>
> Thinking of cheops functionality.

jffnms - http://www.jffnms.org

Easier to configure than nagios, and far more user friendly once you
figure it out.

DaZZa


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[SLUG] Network Card Woes

[Phill O'Flynn]

I have installed an exttra NIC on my fedora server so I can apply some QOS.On the fedora machine as far as I can tell each nic  (eth0 & eth1) has
their own ip address (10.1.1.30 & 10.1.1.31) and are pointing to different
devices ( comparing mac addresses).Howevver it appears that all other
devices on the network seem to get confused as the ip addresses from remote devices
seem to point to the one network cardWhat To Do!!!
RegardsPhill O'Flynn
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[SLUG] Network Card Woes

[Phill O'Flynn]

Thanks for your advice.In the end I put each card on a separate subnet
and used tc to throttle back the connection speed on the nic exposed to the
internet.CBQ might be good at shaping the outgoing traffic from the
server but (from my very limited understanding of tc) it doesn't take into account
other traffic on the connection - fair enough i s'pose..Just
incase you were wondering!!
RegardsPhill O'Flynn
- Original Message
-Subject: Re: [Fwd: Re: [SLUG] Network Card
Woes]From:"Glen Turner" <[EMAIL PROTECTED]>Date:Tue, October 24, 2006 3:30 pmTo:  "Phill O'Flynn"
<[EMAIL PROTECTED]>Cc:  slug@slug.org.auPhill O'Flynn wrote:> So this morning is used the
"tc" command to throttle back my servers > eth0 to 168k and the
voip worked fine. But obviously this became a speed > problem to the
internal network.You can define two classes to tc -- your local subnet
and everythingelse.  Then give 168k to the everything else class and allow
anybandwidth to the local subnet class.  See the CBQ qdisc.--   Glen Turner Tel: (08) 8303 3936 or +61 8 8303 3936  Australia's
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Re: [SLUG] network problem

[Malcolm Valentine]

On Wed, 2002-09-04 at 19:13, mick wrote:
> Hi everyone,
> 
> As briefly as possible.  I have smbfs mount directives in my /etc/fstab 
> directory and they do work.  The mount points are under the /mnt directory.
> 
> The problem is that there is a LOOONNNGGG pause during the boot process, 
> so long infact that I keep finding myself punching the [edit] key to 'help' 
> it along.

Are you sure this isn't a DNS issue, the long pause caused by it trying
to resolve server? It could be an issue with your init scripts.

Cheers,
  Malcolm V. 


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Re: [SLUG] network problem

[Malcolm V]

On Wed, 2002-09-04 at 21:29, mick wrote:
> The server provides DHCP (or is it DNS, I always get those mixed up) to the 
> network of 1 iMac and 2 dual boot Windows XP/Redhat 7.3 machines. The server 
> is spec'ed (according to esmith) for up to 40 users, so I doubt it's a 
> hardware issue.  Eth0 comes up quickly during boot and my PC always get's an 
> IP without any pause. I run a 100 base network.  

Which machine(s) are you trying to mount the samba shares from and which
machine(s) are you editing the /etc/fstab file on?

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RE: [SLUG] network problem

[Tiwari, Rajnish]

Hi,
My 2 bobs worth - but a long time ago I encountered
a similar problem on a HP-UX box. The problem turned
out that the system was trying to do a "hard" mount
at bootup rather than a "soft" mount. (The correct
terminology escapes me - 'twas a long time ago).

If "hard" mount is specified at bootup, and the remote
host cannot be contacted for whatever reason, then bootup
sequence will take a very long time as each 'mount' attempt
in fstab file has to fail with timeout. With a "soft"
mount, the actual "mount" happens when the specified
mount point is first attempted to be read.

Check to see that the hosts in question can be reached
from each other, hostnames resolved etc. 

I am not too certain if there is similar concept in Linux,
although I have setup my slackware boxes for nfs mounts.

Good luck.

Regards,
Rajnish

::>-Original Message-
::>From: mick [mailto:[EMAIL PROTECTED]]
::>Sent: Wednesday, 4 September 2002 7:14 PM
::>To: [EMAIL PROTECTED]
::>Subject: [SLUG] network problem
::>
::>
::>Hi everyone,
::>
::>As briefly as possible.  I have smbfs mount directives in my 
::>/etc/fstab 
::>directory and they do work.  The mount points are under the 
::>/mnt directory.
::>
::>The problem is that there is a LOOONNNGGG pause during 
::>the boot process, 
::>so long infact that I keep finding myself punching the 
::>[edit] key to 'help' 
::>it along.
::>
::>it then says, mount success = 0 and then mounts two of the 
::>three points I have 
::>defined, as far as I can tell it varies in success with each mount...
::>
::>Here's the added lines of my fstab ... editted.
::>
::>/server/micellanous /mnt/micellanous smbfs defaults 0 0
::>/server/music  /mnt/music smbfs defualts 0 0
::>/server/programs /mnt/programs smbfs defaults 0 0
::>
::>okay ... is there anyway to make this run in the background 
::>during the boot 
::>process so I can get rid od the Loonngg wait?  Is there 
::>anyway to get it 
::>mount all points all the time.
::>
::>My server is an esmith 5.0 box with shared ibays.  Works 
::>well with windows 
::>hence the samba mounts.  I will try NFS mounts, but I don't 
::>know if that will 
::>work as there is no /etc/import/export entries on the server.
::>
::>
::>thanks 
::>
::>Mick
::>
::>
::>
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::>
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[SLUG] Network speed testing

[steven]

I used to have a program running under linux which wasa little like
traceroute except that instead of just showing all the hops from one point
to another it somehow tested and displayed the speed of each hop.

I have been googling without success.

Can anyone remember the name of such a tool.

Regards
Steven

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Re: [SLUG] Network Chooser?

[Craige McWhirter]

On Tue, 2002-09-24 at 19:12, Erik de Castro Lopo wrote:
 
> Does Linux have anything similar. I had a look on freshmeat but couldn't
> find anything.

I've started playing with "whereami". Seems promising so far. There are
also about 3 or 4 others too.

$ apt-cache show whereami
Package: whereami
Priority: extra
Section: net
Installed-Size: 384
Maintainer: Andrew McMillan <[EMAIL PROTECTED]>
Architecture: all
Version: 0.2.0
Depends: debconf
Suggests: pcmcia-cs, fping, net-tools, iputils-arping
Filename: pool/main/w/whereami/whereami_0.2.0_all.deb
Size: 53656
MD5sum: 99eb483eed352a7774bebf1ade04660e
Description: Automatically reconfigure your (laptop) system for a new
location
 whereami is a set of useful scripts and a coordinating system for
 automatically re-locating your computer within the current (network)
 environment.
 .
 Typically, you would use whereami to automatically detect and
 re-configure your laptop when you move between a variety of diverse
 networks and/or docking environments.
 .
 Although whereami will work best if all of your networks assign
 addresses through dhcp, this is not a pre-requisite and the system
 allows any technique to be used to ascertain the new location with
 as little ongoing user intervention as possible.
 .
 Having ascertained the correct location, whereami will run appropriate
 (user-configured) scripts to adjust the laptop operation to suit the
 current environment.
 .
 See http://debiana.net/whereami/ for more information.  You may also
 get useful assistance from the debian-laptop mailing list, which is
 frequented by several of the contributors.

-- 

Cheers,
  Craige.

GPG Key fingerprint = C206 904F 5231 2F2E 8DAA  F094 5879 71B5 0960 CF37

http://arseclown.tv/



signature.asc
Description: This is a digitally signed message part

Re: [SLUG] Network Chooser?

[Graham Smith]

On Tue, 24 Sep 2002 19:12, Erik de Castro Lopo wrote:
> Hi all,
>
> MacOSX has this little feature that allows you to have a couple of
> different network setups (ie home with static addres, work with dhcp etc)
> and choose between them from the main menu. The only thing wrong with the
> MacOSX one is that it doesn't seem to work properly however god the idea
> is.
>
> Does Linux have anything similar. I had a look on freshmeat but couldn't
> find anything.
>
> Cheers,
> Erik

Hi Erik,

Have a look at netenv 
http://netenv.sourceforge.net/

Regards,

Graham Smith
-
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Re: [SLUG] network considerations

[James Gregory]

On Mon, 2003-02-03 at 10:31, moise lim wrote:



> my current thoughts are :-
> 
> 1/ leaving the workstations running windows - only for the time being though 
> until i can convince users of the advantages of using a superior o/s in my 
> following points
> 2/ leaving the win2000 svr alone but introducing a samba server and gradually 
> migrating files across to samba until enuff load has been shedded on the 
> win2000 svr
> 3/ introducing a linux-based mail svr to replace the windows based one
> 4/ introducing a linux-based proxy to replace the windows based one
> 5/ introducing a linux-based firewall to provide good security

ok, how many boxes do you have to play with?

I'll prefix this - I'm making a lot of assumptions from that description
to give you a starting point to tell us the stuff that I got all wrong
:)

proxy and firewall should probably be the same machine. Then you can do
transparent proxying (well, you can do it otherwise, but having it on
the same machine is nice, and there isn't much advantage to separating
them)

when you say "mail server" - do you mean a computer to receive mail from
the internet? (ie, do the MX records point to this box?) I'm assuming
not given the unreliable connection -- this answer would be slightly
different if that were the case. So, I'm assuming that this is just a
machine to store mail locally and pass outgoing mail to another MTA
somewhere. I would make the fileserver and the mail server the same box
(unless there was a reason not to). You probably want to have a box with
RAID for this, and it's nice to keep all the stuff you need RAIDed in
one place (again, more assumptions there). I'd run Courier IMAP
(interesting observation from one who just migrated to it -- much faster
but it takes about 20-30% more diskspace than uw-imap for storing mail),
fetchmail, spamassassin (now there's a cool way to impress your windows
loving clients), postfix as a smart relay. I'm told that XFS is all the
rage when it comes to choice of reliable, fast filesystem (I'm running
reiserfs here, and I love it but there's no recovery tools)

If you just mean a machine to use to deliver mail *to* the internet,
then as above but with just postfix.

I would also consider using ldap on such a network for a user database -
it makes it easier to add stuff like proxy authentication if you happen
to need it -- you get a bonus global address book too. I'd also run that
on your mail/fileserver. There's also some nifty thing that lets you get
squid to authenticate against the samba authentication stuff, and samba
in turn to authenticate against ldap (when I did it last you went
through pam, there might be a better way now).

There are other nifty things you can do with ldap but I don't think
they're relevant here.

As you say, I would leave the workstations running win2k. It's a lot of
change very quickly, and I think you need cred from a grooving server
install first. That said you might want to install some open source
tools on their boxes so they can start exploring if they desire. Throw
mozilla on there and whatever office suite is best on linux these days
(open office?)

For 30 users I would say it's probably worth moving to adsl or one of
its cousins.

> 
> as a relatively newcomer to linux.. i m curious to know what other folks are 
> doing for smallish networks like my example...

well, I've setup systems like the above before and find they work very
well. I used to have problems with samba, but it seems to be pretty good
these days.

> 
> are there other things i should be considering?? i don't think a dhcp svr is 
> reuired only becos i go around setting static IPs...

I'd set up a dhcp server anyway. It means you've got a central place to
do configuration changes if you need to and it means you can just plug
in new computers and have them work straight off without doing any work.
Put it on the firewall.

Is that the sort of information you're looking for?

HTH,

James.


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[SLUG] Network card settings

[mark . crisp]

Hi Sluggers,

Does anyone know how to change your network card settings from auto to (
10/100, full/half ) as the xircom pcmcia card does not auto negotiate with
Cisco 4000 switch to well. Also the Cisco has spanning tree running.

linux ver - Mandrake 8.1, module used - tulop_cb & cb_enabler

I am hoping there is a config file somewhere that I have missed.

cheers

Mark


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RE: [SLUG] Network Problem

[El 4Love]

I tried them independently as well. I first tried with the router, but
no sign of success. Then Tried to restart the switch and it worked. I
still haven't got an opportunity to test it the other way round.
Hopefully later today. :(

~mahen

On Mon, 2003-06-23 at 14:08, Robert Tillsley wrote:
> Does it require both the switch and the router to be restarted, or have you
> tried each one independently?
> 
> Regards
> 
> Rob T
> 
> > -Original Message-
> > From: El 4Love [mailto:[EMAIL PROTECTED]
> > Sent: Monday, 23 June 2003 4:06 PM
> > To: Sydney LUG
> > Subject: [SLUG] Network Problem
> > 
> > 
> > Hello All,
> > 
> > I have encountered a problem with our network.
> > Following is diagrams shows how our computers are connected.
> > 
> > Internet
> > |
> > |
> > ADSL Router/Firewall
> > |
> > |
> >| |  
> > Switch  Workstation1  
> >| 
> >  __|___ 
> > |  |   
> > Other Workstations   Linux Server
> > 
> > The problem with our network is that, it stops functioning 
> > after about a
> > day or so, and then I have to restart the router and switch 
> > (switch-off
> > and switch-on) to resume normal operations. The linux server 
> > runs a web
> > server, and when this happens the browser from the external computer
> > says, network unreachable. I won't even be able to ping any of the
> > machines from any other machine in the network. I use all private IP
> > addresses for all the machines.
> > 
> > Can anyone suggest where to look for?
> > 
> > ~mahen
> > 
> > -- 
> > SLUG - Sydney Linux User's Group - http://slug.org.au/
> > More Info: http://lists.slug.org.au/listinfo/slug
> > 
> 
> *
> This mail, including any attached files may contain
> confidential and privileged information for the sole
> use of the intended recipient(s). Any review, use, 
> distribution or disclosure by others is strictly prohibited.
> If you are not the intended receipient (or authorised to 
> receive information for the recipient), please contact 
> the sender by reply e-mail and delete all copies of
> this message.
> *
> 

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RE: [SLUG] Network Problem

[Robert Tillsley]

Hmmm, well I'd give that a go first. Is your switch a managed one (ie can
you connect to it and look at data traffic/port errors etc)

Regards

Rob T

> -Original Message-
> From: El 4Love [mailto:[EMAIL PROTECTED]
> Sent: Monday, 23 June 2003 4:13 PM
> To: Robert Tillsley
> Cc: Sydney LUG
> Subject: RE: [SLUG] Network Problem
> 
> 
> I tried them independently as well. I first tried with the router, but
> no sign of success. Then Tried to restart the switch and it worked. I
> still haven't got an opportunity to test it the other way round.
> Hopefully later today. :(
> 
> ~mahen
> 
> On Mon, 2003-06-23 at 14:08, Robert Tillsley wrote:
> > Does it require both the switch and the router to be 
> restarted, or have you
> > tried each one independently?
> > 
> > Regards
> > 
> > Rob T
> > 
> > > -Original Message-
> > > From: El 4Love [mailto:[EMAIL PROTECTED]
> > > Sent: Monday, 23 June 2003 4:06 PM
> > > To: Sydney LUG
> > > Subject: [SLUG] Network Problem
> > > 
> > > 
> > > Hello All,
> > > 
> > > I have encountered a problem with our network.
> > > Following is diagrams shows how our computers are connected.
> > > 
> > >   Internet
> > >   |
> > >   |
> > >   ADSL Router/Firewall
> > > |
> > > |
> > >| |  
> > > Switch  Workstation1  
> > >|  
>
> > >  __|___ 
> > > |  |   
> > > Other Workstations   Linux Server
> > > 
> > > The problem with our network is that, it stops functioning 
> > > after about a
> > > day or so, and then I have to restart the router and switch 
> > > (switch-off
> > > and switch-on) to resume normal operations. The linux server 
> > > runs a web
> > > server, and when this happens the browser from the 
> external computer
> > > says, network unreachable. I won't even be able to ping any of the
> > > machines from any other machine in the network. I use all 
> private IP
> > > addresses for all the machines.
> > > 
> > > Can anyone suggest where to look for?
> > > 
> > > ~mahen
> > > 
> > > -- 
> > > SLUG - Sydney Linux User's Group - http://slug.org.au/
> > > More Info: http://lists.slug.org.au/listinfo/slug
> > > 
> > 
> > *
> > This mail, including any attached files may contain
> > confidential and privileged information for the sole
> > use of the intended recipient(s). Any review, use, 
> > distribution or disclosure by others is strictly prohibited.
> > If you are not the intended receipient (or authorised to 
> > receive information for the recipient), please contact 
> > the sender by reply e-mail and delete all copies of
> > this message.
> > *
> > 
> 

*
This mail, including any attached files may contain
confidential and privileged information for the sole
use of the intended recipient(s). Any review, use, 
distribution or disclosure by others is strictly prohibited.
If you are not the intended receipient (or authorised to 
receive information for the recipient), please contact 
the sender by reply e-mail and delete all copies of
this message.
*
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Re: [SLUG] Network Problem

[moise lim]

On Monday 23 June 2003 04:05 pm, El 4Love wrote:
> Hello All,
>
> I have encountered a problem with our network.
> Following is diagrams shows how our computers are connected.
>
>   Internet
>
>
>   ADSL Router/Firewall
>
> |
>
> Switch  Workstation1
>
>  __|___
>
> Other Workstations   Linux Server
>
 and switch-on) to resume normal operations. The linux server runs a web
> server, and when this happens the browser from the external computer
> says, network unreachable. I won't even be able to ping any of the

i know i m slightly off topic here ... but if the linux box is running a web 
server .. i m assuming that it is an internal web server and not something 
which is accessible from the internet???

if the web server is accessible from the internet .. isn't such a setup a bit 
risky???

m
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Re: [SLUG] Network Problem

[dazza]

On 23 Jun 2003, El 4Love wrote:

> I have encountered a problem with our network.
> Following is diagrams shows how our computers are connected.
>
>   Internet
>   |
>   |
>   ADSL Router/Firewall
> |
> |
>| |
> Switch  Workstation1
>|
>  __|___
> |  |
> Other Workstations   Linux Server
>
> The problem with our network is that, it stops functioning after about a
> day or so, and then I have to restart the router and switch (switch-off
> and switch-on) to resume normal operations. The linux server runs a web
> server, and when this happens the browser from the external computer
> says, network unreachable. I won't even be able to ping any of the
> machines from any other machine in the network. I use all private IP
> addresses for all the machines.
>
> Can anyone suggest where to look for?

Sounds like your switch is fubar.

Have you tried replacing it with a spare or borrowed one to see if the
problem disappears?

Also, have you looked for heat problems with the switch? Could be the
switch is overheating, and this causes it to lockup. Unlikely, but
possible.

DaZZa

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Re: [SLUG] Network Problem

[El 4Love]

Thanks to everyone.

As every one suggested, the switch had the problem.

I have already replace it with a new one and things seems alright now.

Fortunately, all the network cards works fine.

~mahen.

On Wed, 2003-06-25 at 08:49, [EMAIL PROTECTED] wrote:
> On 23 Jun 2003, El 4Love wrote:
> 
> > I have encountered a problem with our network.
> > Following is diagrams shows how our computers are connected.
> >
> > Internet
> > |
> > |
> > ADSL Router/Firewall
> > |
> > |
> >| |
> > Switch  Workstation1
> >|
> >  __|___
> > |  |
> > Other Workstations   Linux Server
> >
> > The problem with our network is that, it stops functioning after about a
> > day or so, and then I have to restart the router and switch (switch-off
> > and switch-on) to resume normal operations. The linux server runs a web
> > server, and when this happens the browser from the external computer
> > says, network unreachable. I won't even be able to ping any of the
> > machines from any other machine in the network. I use all private IP
> > addresses for all the machines.
> >
> > Can anyone suggest where to look for?
> 
> Sounds like your switch is fubar.
> 
> Have you tried replacing it with a spare or borrowed one to see if the
> problem disappears?
> 
> Also, have you looked for heat problems with the switch? Could be the
> switch is overheating, and this causes it to lockup. Unlikely, but
> possible.
> 
> DaZZa
> 
> 

-- 
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug

Re: [SLUG] Network Problem

[El 4Love]

i was only involved in programming  on machines setup by administrators
all this while and now only I managed to setup my own network at home. 

I am certainly not aware of many of the security related issues. I would
appreciate if someone could let me know how bad the security is in my
network, and suggestions to rectify it.

~m.

On Mon, 2003-06-23 at 18:09, moise lim wrote:
> On Monday 23 June 2003 04:05 pm, El 4Love wrote:
> > Hello All,
> >
> > I have encountered a problem with our network.
> > Following is diagrams shows how our computers are connected.
> >
> > Internet
> >
> >
> > ADSL Router/Firewall
> >
> > |
> >
> > Switch  Workstation1
> >
> >  __|___
> >
> > Other Workstations   Linux Server
> >
>  and switch-on) to resume normal operations. The linux server runs a web
> > server, and when this happens the browser from the external computer
> > says, network unreachable. I won't even be able to ping any of the
> 
> i know i m slightly off topic here ... but if the linux box is running a web 
> server .. i m assuming that it is an internal web server and not something 
> which is accessible from the internet???
> 
> if the web server is accessible from the internet .. isn't such a setup a bit 
> risky???
> 
> m

-- 
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug

Re: [SLUG] Network Problem

[moise lim]

On Wednesday 25 June 2003 11:07 am, El 4Love wrote:
> i was only involved in programming  on machines setup by administrators
> all this while and now only I managed to setup my own network at home.
>
> I am certainly not aware of many of the security related issues. I would
> appreciate if someone could let me know how bad the security is in my
> network, and suggestions to rectify it.

well... i m no expert on network security and i can only go by what i have 
come across in my readings ... 

my understanding is that a more secure setup is probably 

   
   Internet
   
  /
  /
   ---
   ADSL
   ---
  /
  /
   -
   Web svr
   -
  /
  /
   -
   Firewall
   -
  /
  /
   --
   My Network
   --

as i do not have a publicly accessed web svr myself .. i am simply guessing at 
the above topology ... and i m happy to be corrected by those more familiar 
with such matters :)

i have seen previously from one of the other postings where a firewall was 
installed between the ADSL and Web Svr as well
-- 
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug

Re: [SLUG] Network Problem

[Phil Scarratt]

Yes, a DMZ is setup in such a way:


Internet

 |

Firewall

 |

Servers for
public use
eg Web, mail
etc

 |

Firewall

 |

Internal lan

Of course, depending on your purposes and resources this may be over the 
top.

Fil

moise lim wrote:
On Wednesday 25 June 2003 11:07 am, El 4Love wrote:

i was only involved in programming  on machines setup by administrators
all this while and now only I managed to setup my own network at home.
I am certainly not aware of many of the security related issues. I would
appreciate if someone could let me know how bad the security is in my
network, and suggestions to rectify it.


well... i m no expert on network security and i can only go by what i have 
come across in my readings ... 

my understanding is that a more secure setup is probably 

   
   Internet
   
  /
  /
   ---
   ADSL
   ---
  /
  /
   -
   Web svr
   -
  /
  /
   -
   Firewall
   -
  /
  /
   --
   My Network
   --
as i do not have a publicly accessed web svr myself .. i am simply guessing at 
the above topology ... and i m happy to be corrected by those more familiar 
with such matters :)

i have seen previously from one of the other postings where a firewall was 
installed between the ADSL and Web Svr as well


--
Phil Scarratt
Draxsen Technologies
IT Contractor/Consultant
0403 53 12 71
--
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug

RE: [SLUG] Network Problem

[Robert Tillsley]

Though for efficiency:

    
 Internet   
    
   |
    DMZ Servers for
 Firewall   --  public use
    eg Web, mail
etc   
|    

 
 Internal lan
 


Regards

Rob T

> -Original Message-
> From: Phil Scarratt [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, 25 June 2003 3:24 PM
> To: moise lim
> Cc: Sydney LUG
> Subject: Re: [SLUG] Network Problem
> 
> 
> Yes, a DMZ is setup in such a way:
> 
> 
> Internet
> 
>   |
> 
> Firewall
> 
>   |
> 
> Servers for
> public use
> eg Web, mail
> etc
> 
>   |
> 
> Firewall
> 
>   |
> 
> Internal lan
> 
> 
> Of course, depending on your purposes and resources this may 
> be over the 
> top.
> 
> Fil
> 
> moise lim wrote:
> > On Wednesday 25 June 2003 11:07 am, El 4Love wrote:
> > 
> >>i was only involved in programming  on machines setup by 
> administrators
> >>all this while and now only I managed to setup my own 
> network at home.
> >>
> >>I am certainly not aware of many of the security related 
> issues. I would
> >>appreciate if someone could let me know how bad the 
> security is in my
> >>network, and suggestions to rectify it.
> > 
> > 
> > well... i m no expert on network security and i can only go 
> by what i have 
> > come across in my readings ... 
> > 
> > my understanding is that a more secure setup is probably 
> > 
> >
> >Internet
> >
> >   /
> >   /
> >---
> >ADSL
> >---
> >   /
> >   /
> >-
> >Web svr
> >-
> >   /
> >   /
> >-
> >Firewall
> >-
> >   /
> >   /
> >--
> >My Network
> >--
> > 
> > as i do not have a publicly accessed web svr myself .. i am 
> simply guessing at 
> > the above topology ... and i m happy to be corrected by 
> those more familiar 
> > with such matters :)
> > 
> > i have seen previously from one of the other postings where 
> a firewall was 
> > installed between the ADSL and Web Svr as well
> 
> 
> -- 
> Phil Scarratt
> Draxsen Technologies
> IT Contractor/Consultant
> 0403 53 12 71
> 
> -- 
> SLUG - Sydney Linux User's Group - http://slug.org.au/
> More Info: http://lists.slug.org.au/listinfo/slug
> 

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Re: [SLUG] Network Problem

[Phil Scarratt]

In some circumstances agreed. There are lots of arguments for a DMZ 
however. Do a quick google for DMZ (or de-militarized zone) and you will 
come up with a stack of hits on DMZ's and their use. I think the basic 
theory is that the public side firewall is more open than the internal 
side firewall - hence a hacker needs to get past 2 firewalls before 
being able to do something.



Mz wrote:
2 Firewalls?

thats insane!

it means the first firewall is not configured properly,

martin

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Phil Scarratt
Sent: Wednesday, 25 June 2003 3:24 PM
To: moise lim
Cc: Sydney LUG
Subject: Re: [SLUG] Network Problem
Yes, a DMZ is setup in such a way:


Internet

  |

Firewall

  |

Servers for
public use
eg Web, mail
etc

  |

Firewall

  |

Internal lan

Of course, depending on your purposes and resources this may be over the
top.
Fil

moise lim wrote:

On Wednesday 25 June 2003 11:07 am, El 4Love wrote:


i was only involved in programming  on machines setup by administrators
all this while and now only I managed to setup my own network at home.
I am certainly not aware of many of the security related issues. I would
appreciate if someone could let me know how bad the security is in my
network, and suggestions to rectify it.


well... i m no expert on network security and i can only go by what i have
come across in my readings ...
my understanding is that a more secure setup is probably

  
  Internet
  
 /
 /
  ---
  ADSL
  ---
 /
 /
  -
  Web svr
  -
 /
 /
  -
  Firewall
  -
 /
 /
  --
  My Network
  --
as i do not have a publicly accessed web svr myself .. i am simply
guessing at

the above topology ... and i m happy to be corrected by those more
familiar

with such matters :)

i have seen previously from one of the other postings where a firewall was
installed between the ADSL and Web Svr as well


--
Phil Scarratt
Draxsen Technologies
IT Contractor/Consultant
0403 53 12 71
--
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug


--
Phil Scarratt
Draxsen Technologies
IT Contractor/Consultant
0403 53 12 71
--
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug

Re: [SLUG] Network Problem

[mkraus]

G'day

Ok... more of a security than linux issue...

The way you described leaves your web server overly exposed - better to place it in a DMZ.


Internet  --  ADSL router/modem  --  Firewall  --  Internal Network
                                                        |
                                                        |
                                                        |
                                                    Web Server


Note that your web server and internal network exist on two different network segments, with the firewall controlling access.


An even more secure setup would be as follows:


Internet -- ADSL router/modem -- Firewall -- Web Server -- Firewall -- Internal Network


Where your two firewalls are of different vendors.




Warmest regards

Mike
---
Michael S. E. Kraus
Network Administrator
Capital Holdings Group (NSW) Pty Ltd
p: (02) 9955 8000






moise lim <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
25/06/2003 03:01 PM

        
        To:        Sydney LUG <[EMAIL PROTECTED]>
        cc:        
        Subject:        Re: [SLUG] Network Problem


On Wednesday 25 June 2003 11:07 am, El 4Love wrote:
> i was only involved in programming  on machines setup by administrators
> all this while and now only I managed to setup my own network at home.
>
> I am certainly not aware of many of the security related issues. I would
> appreciate if someone could let me know how bad the security is in my
> network, and suggestions to rectify it.

well... i m no expert on network security and i can only go by what i have 
come across in my readings ... 

my understanding is that a more secure setup is probably 

                                           
                                           Internet
                                           
                                              /
                                              /
                                           ---
                                           ADSL
                                           ---
                                              /
                                              /
                                           -
                                           Web svr
                                           -
                                              /
                                              /
                                           -
                                           Firewall
                                           -
                                              /
                                              /
                                           --
                                           My Network
                                           --

as i do not have a publicly accessed web svr myself .. i am simply guessing at 
the above topology ... and i m happy to be corrected by those more familiar 
with such matters :)

i have seen previously from one of the other postings where a firewall was 
installed between the ADSL and Web Svr as well
-- 
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug


-- 
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug

Re: [SLUG] Network Problem

[mkraus]

G'day...        

Don't forget that a DMZ does not require two firewalls - just two different segments running off one firewall. A two firewall setup is used when being ultra-paranoid. Two different firewalls are to be used, which means if one is exploited using cracker-technique-x it means that it is unlikely that cracker-technique-x will also be able to exploit the second firewall.

As I said - its when the resources can be afforded and when you're being ultra-paranoid - which such a bad thing at the best of times.

Warmest regards

Mike
---
Michael S. E. Kraus
Network Administrator
Capital Holdings Group (NSW) Pty Ltd
p: (02) 9955 8000






Phil Scarratt <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
25/06/2003 09:02 PM

        
        To:        Mz <[EMAIL PROTECTED]>, SLUG <[EMAIL PROTECTED]>
        cc:        
        Subject:        Re: [SLUG] Network Problem


In some circumstances agreed. There are lots of arguments for a DMZ 
however. Do a quick google for DMZ (or de-militarized zone) and you will 
come up with a stack of hits on DMZ's and their use. I think the basic 
theory is that the public side firewall is more open than the internal 
side firewall - hence a hacker needs to get past 2 firewalls before 
being able to do something.



Mz wrote:
> 2 Firewalls?
> 
> thats insane!
> 
> it means the first firewall is not configured properly,
> 
> martin
> 
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> Behalf Of Phil Scarratt
> Sent: Wednesday, 25 June 2003 3:24 PM
> To: moise lim
> Cc: Sydney LUG
> Subject: Re: [SLUG] Network Problem
> 
> 
> Yes, a DMZ is setup in such a way:
> 
> 
> Internet
> 
>       |
> 
> Firewall
> 
>       |
> 
> Servers for
> public use
> eg Web, mail
> etc
> 
>       |
> 
> Firewall
> 
>       |
> 
> Internal lan
> 
> 
> Of course, depending on your purposes and resources this may be over the
> top.
> 
> Fil
> 
> moise lim wrote:
> 
>>On Wednesday 25 June 2003 11:07 am, El 4Love wrote:
>>
>>
>>>i was only involved in programming  on machines setup by administrators
>>>all this while and now only I managed to setup my own network at home.
>>>
>>>I am certainly not aware of many of the security related issues. I would
>>>appreciate if someone could let me know how bad the security is in my
>>>network, and suggestions to rectify it.
>>
>>
>>well... i m no expert on network security and i can only go by what i have
>>come across in my readings ...
>>
>>my understanding is that a more secure setup is probably
>>
>>                                           
>>                                           Internet
>>                                           
>>                                              /
>>                                              /
>>                                           ---
>>                                           ADSL
>>                                           ---
>>                                              /
>>                                              /
>>                                           -
>>                                           Web svr
>>                                           -
>>                                              /
>>                                              /
>>                                           -
>>                                           Firewall
>>                                           -
>>                                              /
>>                                              /
>>                                           --
>>                                           My Network
>>                                           --
>>
>>as i do not have a publicly accessed web svr myself .. i am simply
> 
> guessing at
> 
>>the above topology ... and i m happy to be corrected by those more
> 
> familiar
> 
>>with such matters :)
>>
>>i have seen previously from one of the other postings where a firewall was
>>installed between the ADSL and Web Svr as well
> 
> 
> 
> --
> Phil Scarratt
> Draxsen Technologies
> IT Contractor/Consultant
> 0403 53 12 71
> 
> --
> SLUG - Sydney Linux User's Group - http://slug.org.au/
> More Info: http://lists.slug.org.au/listinfo/slug
> 


-- 
Phil Scarratt
Draxsen Technologies
IT Contractor/Consultant
0403 53 12 71

-- 
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug


-- 
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug

RE: [SLUG] Network Monitor

[George Vieira]

I'm using NTOP and thank God for that... I found where my traffic was coming
from as before linux was my firewall/gateway/proxy, I had no idea where the
ISP costs were coming from After the linux box was put in, NTOP showed
that while most users were transfering around 100KB to 500MB since the linux
box was up (3 months ago), the most traffic was fron the reception desk..

I guess she's a big browser of the net at 9GB... yep you saw it right 9
GIGs...

Figure that out.

-Original Message-
From: Carlo Nizeti [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 16, 2000 7:39 PM
To: [EMAIL PROTECTED]
Subject: [SLUG] Network Monitor


hello all

I'm after a program for X that will show graphically the status of my linux
gateway. Specifically how many K are going through each Ethernet card and
how many megs have been done through each Ethernet card. Sorta like the
Microsoft (gasp!) system monitor.

Carlo
--
[EMAIL PROTECTED] ([EMAIL PROTECTED])


"`Right,' said Ford, `I'm going to have a look.'
He glanced round at the others.
`Is no one going to say, "No you can't possibly, let me go instead"?'
They all shook their heads.
`Oh well.'" 
-- Douglas Adams 



--
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More Info: http://slug.org.au/lists/listinfo/slug


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More Info: http://slug.org.au/lists/listinfo/slug

RE: [SLUG] Network Monitor

[Michael]

I bet she uses some streaming audio application.. how about windows media
player attached to her radio station of choice :)

On Wed, 16 Aug 2000, George Vieira wrote:

> I'm using NTOP and thank God for that... I found where my traffic was coming
> from as before linux was my firewall/gateway/proxy, I had no idea where the
> ISP costs were coming from After the linux box was put in, NTOP showed
> that while most users were transfering around 100KB to 500MB since the linux
> box was up (3 months ago), the most traffic was fron the reception desk..
> 
> I guess she's a big browser of the net at 9GB... yep you saw it right 9
> GIGs...
> 
> Figure that out.
> 
> -Original Message-
> From: Carlo Nizeti [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, August 16, 2000 7:39 PM
> To: [EMAIL PROTECTED]
> Subject: [SLUG] Network Monitor
> 
> 
> hello all
> 
> I'm after a program for X that will show graphically the status of my linux
> gateway. Specifically how many K are going through each Ethernet card and
> how many megs have been done through each Ethernet card. Sorta like the
> Microsoft (gasp!) system monitor.
> 
> Carlo
> --
> [EMAIL PROTECTED] ([EMAIL PROTECTED])
> 
> 
> "`Right,' said Ford, `I'm going to have a look.'
> He glanced round at the others.
> `Is no one going to say, "No you can't possibly, let me go instead"?'
> They all shook their heads.
> `Oh well.'" 
> -- Douglas Adams 
> 
> 
> 
> --
> SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/
> More Info: http://slug.org.au/lists/listinfo/slug
> 
> 
> --
> SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/
> More Info: http://slug.org.au/lists/listinfo/slug
> 



--
SLUG - Sydney Linux User Group Mailing List - http://slug.org.au/
More Info: http://slug.org.au/lists/listinfo/slug

RE: [SLUG] Network Monitor

[George Vieira]

Not unless she puts her ears right up against the CPU and listen to the
noise without speakers...

I think it's just the amount of browsing without proxy caching and possibly
even the ICQ or MSN or whatever all added up..

No wonder we've gone through some receptionists... THEY'RE BORED

-Original Message-
From: Michael [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 16, 2000 8:17 PM
To: George Vieira
Cc: 'Carlo Nizeti'; [EMAIL PROTECTED]
Subject: RE: [SLUG] Network Monitor



I bet she uses some streaming audio application.. how about windows media
player attached to her radio station of choice :)

On Wed, 16 Aug 2000, George Vieira wrote:

> I'm using NTOP and thank God for that... I found where my traffic was
coming
> from as before linux was my firewall/gateway/proxy, I had no idea where
the
> ISP costs were coming from After the linux box was put in, NTOP showed
> that while most users were transfering around 100KB to 500MB since the
linux
> box was up (3 months ago), the most traffic was fron the reception desk..
> 
> I guess she's a big browser of the net at 9GB... yep you saw it right 9
> GIGs...
> 
> Figure that out.
> 
> -Original Message-
> From: Carlo Nizeti [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, August 16, 2000 7:39 PM
> To: [EMAIL PROTECTED]
> Subject: [SLUG] Network Monitor
> 
> 
> hello all
> 
> I'm after a program for X that will show graphically the status of my
linux
> gateway. Specifically how many K are going through each Ethernet card and
> how many megs have been done through each Ethernet card. Sorta like the
> Microsoft (gasp!) system monitor.
> 
> Carlo
> --
> [EMAIL PROTECTED] ([EMAIL PROTECTED])
> 
> 
> "`Right,' said Ford, `I'm going to have a look.'
> He glanced round at the others.
> `Is no one going to say, "No you can't possibly, let me go instead"?'
> They all shook their heads.
> `Oh well.'" 
> -- Douglas Adams 
> 
> 
> 
> --
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> More Info: http://slug.org.au/lists/listinfo/slug
> 
> 
> --
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> 


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Re: [SLUG] Network Monitor

[Arunava Sen]

Carlo Nizeti wrote:

> Specifically how many K are going through each Ethernet card and
> how many megs have been done through each Ethernet card.

What you want is something like "Xnetload". it does exactly what you
want. i use it all the time. the Freshmeat URL is: 

http://freshmeat.net/appindex/1998/06/17/898081865.html

However, i dont think it actually gives you "total K done" etc. but the
version i am running was old and i have modified it so that it does. Get
the new one, if it still doesnt show a "total Bytes" detail, then i'll
send you the source for my version.

hope this helps.

Arun


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Re: [SLUG] Network Monitor

[Rodos]

On Wed, 16 Aug 2000, Carlo Nizeti wrote:

> I'm after a program for X that will show graphically the status of my linux
> gateway. Specifically how many K are going through each Ethernet card and
> how many megs have been done through each Ethernet card. Sorta like the
> Microsoft (gasp!) system monitor.

I use and recomend pload.

http://www.engr.utk.edu/~mdsmith/pload/

Rodos
 
-- 
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Re: [SLUG] Network Monitor

[Thom May]

Nice one! We've been looking for a decent stats creation tool
for fscking ages. logging through ipchains was killing the
firewall box, and none of the other things we found worked
properly.
NTOP rocks :-)
cheers
thom
At some point around Wed, Aug 16, 2000 at 08:11:32PM +1000, George Vieira spaketh 
thusly:
> I'm using NTOP and thank God for that... I found where my traffic was coming
> from as before linux was my firewall/gateway/proxy, I had no idea where the
> ISP costs were coming from After the linux box was put in, NTOP showed
> that while most users were transfering around 100KB to 500MB since the linux
> box was up (3 months ago), the most traffic was fron the reception desk..
> 
> I guess she's a big browser of the net at 9GB... yep you saw it right 9
> GIGs...
> 
> Figure that out.
> 
> -Original Message-
> From: Carlo Nizeti [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, August 16, 2000 7:39 PM
> To: [EMAIL PROTECTED]
> Subject: [SLUG] Network Monitor
> 
> 
> hello all
> 
> I'm after a program for X that will show graphically the status of my linux
> gateway. Specifically how many K are going through each Ethernet card and
> how many megs have been done through each Ethernet card. Sorta like the
> Microsoft (gasp!) system monitor.
> 
> Carlo
> --
> [EMAIL PROTECTED] ([EMAIL PROTECTED])
> 
> 
> "`Right,' said Ford, `I'm going to have a look.'
> He glanced round at the others.
> `Is no one going to say, "No you can't possibly, let me go instead"?'
> They all shook their heads.
> `Oh well.'" 
> -- Douglas Adams 
> 
> 
> 
> --
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> More Info: http://slug.org.au/lists/listinfo/slug
> 
> 
> --
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(T) +44 (0)20 7440 3955
(F) +44 (0)20 7613 5333
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RE: [SLUG] Network Monitor

[Jill Rowling]

Maybe they should give her a copy of Quanta and get her to design a company
intranet page in her spare time. On Linux of course.

- Jill.

___
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Snr Design Engineer & Unix System Administrator
Electronic Engineering Department, Aristocrat Technologies Australia
3rd Floor, 77 Dunning Ave Rosebery NSW 2018
Phone:  (02) 9697-4484  Fax:(02) 9663-1412
Email:  [EMAIL PROTECTED]
 
From: George Vieira [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, 16 August 2000 20:21
No wonder we've gone through some receptionists... THEY'RE BORED


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[SLUG] Network card data

[Ken Caldwell]

Hi,
I have a couple of network cards that I would like to try out but have
no data for.  My searches this morning seem to turn up lots of leads but
none seem to get me anywhere in the end.

The first card is an Accton P/N: 142650-400 REV:01D which has a large
chip marked MPXT 448AJ24391150

The second is from Racal-Datacom and carries a sticker on one side with
the numbers 625-0331-01 REV AB and on the other side a sticker
620-0331-01 REV AB.  The chip on this card is an AMD chip AM79C960KC

Does any one know which kernel modules are required for these cards?

TIA

Ken


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[SLUG] Network/Security fest

[Paris Paraskevopoulos]

Hi all,

This is just a reminder that we still are seeking an organiser for the
Network/Security fest to be held November 18th.

The Committee is seeking highly motivated individual(s) who love to be
challenged to volunteer to organise the Network/Security fest to be held
18th Novemeber.

You will need to organise the format/structure, find speakers, send
annoucments, get sponsors if appropriate etc. The committee will be
providing assitance with advertising the event on the Web, room
arrangements, we may have some speakers already. I can provide details
of last years Network fest structure and topics.

Please reply to me for more details.

Paris & the Committee





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[SLUG] Network Security Fest

[David Kempe]

SLUG is having a Network Security Fest/Forum!

Yes that's right, a bunch of Linux geeks getting together to talk about
securing your linux box against the big bad nasties out there.
Or to put it more formally, SLUG is having a forum on securing linux in a
variety of situations. I have volunteered to be the organiser, and as such
am announcing that the event is on the 18th of November.
This first announcement is a call for speakers on a range of topics relating
to security. We are looking for knowledgeable speakers on topics ranging
from basic to advanced linux security. We are planning to start the day
simple, say with the OSI model and understanding basic internetworking,
moving thru to more difficult/complex things such as advanced firewalling
and/or routing etc.
I am calling for anyone who is willing to talk on a favourite topic in this
area to reply to this message with your topic and about how log you are
willing to talk. At the moment we are taking speakers and organising the
format of the event, but it will be very much hands on practical and useful,
once we get past some useful theory.
If anyone has any suggestions as what they would like out of a linux
security forum/fest please reply as well - all suggestions seriously
considered :-)

Yours,

David Kempe
Organiser,
SLUG security fest



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[SLUG] Network Security Fest

[David Kempe]

Network Security Fest


The SLUG Network Security Fest is going ahead on the 25th of November.
Details are below. The Fest will focus on topics from the basic to the
complex, all related to securing your Linux box in typical situations. We
have a few speakers on some of these topics, however we could do with a few
(maybe 2-3) more. So if you think you can rave on and maybe answer a few
questions on a security related topic, please send me mail and I can add you
to the list. I will announce the precise schedule once it is finalised.

Location:
Level 1,
591 Pacific Hwy
Chatswood, NSW
(office of eseller - the entrance is in Bryson St)
Fair amount of parking not too far, and the walk from Artarmon or
Chatswood station is pretty easy.

When:
11am - 4pm or whenever we decide to go home.
We will stop for lunch around 1pm - if anyone objects to pizza let me
know.

How you can help:
Register!!! http://www.slug.org.au
There is a limit of 30 people so get in quick!
Speak!! send email to [EMAIL PROTECTED] and we can arrange it.
Then of course, turn up :) Also, see below...

How much:
$5 for SLUG members,
$10 for non-members. There will be a provision to join on the day.




I am having a little difficulty arranging a projector that is data capable.
We have got pretty much everything else, but if anyone can help out with the
loan/rent of a data projector I would love to hear from them.

Also, thanks go to eseller (http://www.eseller.com.au) for the venue and the
support.
If ever you want great quality hardware for great prices, check them out,
great prices on things like HP servers that work great with Linux.


Yours,

David Kempe


_
Organiser
Network Security Fest
SLUG






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Re: [SLUG] Network authentication

[Craige McWhirter]

We're in the progress of doing this ourselves at the moment. I don't think
it's something you can just "do". I'm reading "Understanding and Deploying
LDAP Directory Services" and doing some research on the net (Google is your
friend). From what I've seen so far moving to LDAP looks like it needs a
fair bit of planning and that's the approach I'm taking. 

On Mon, 04 Dec 2000 15:34:22 James Wilkinson wrote:
> I need to upgrade the old auth mechanism at work, because it's
> hella-broken (syncing passwd files across machines), and it's come back
> to bite me today, so I really want to do soemthing like NIS, only not
> NIS.
> 
> I'm thinking authentication using either LDAP or Kerberos, so I'd like
> comments and tips from anyone who's used either of these services.
> 
> Oh, and the server is a Debian potato machine, so relevant packages would
> be useful, too.
> 
> -- 
>  * dpkg ponders: 'C++' should have been called 'D'
> (o_ ' -- #Debian
> //\  
> v_/_
> 
> 
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> 

-- 

Cheers,
  Craige.

--
Apt-get a clue. Apt-get Debian.


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RE: [SLUG] Network authentication

[Jill Rowling]

Hi all,

NIS is "nice" ie super easy to set up and use but really sadly broken in
that any user can see what's in /etc/shadow.
The only reason why you would want to use it is if you have to support some
NIS-only clients like IRIX O2s AND you never have internet connections from
the LAN.

NIS+ (NISplus) is no-where near as broken but can be more tricky to set up.
It uses kerberos.

Anand gave a nice talk on his setup earlier this year - hey, Anand - is it
still operational?

Regards,

Jill. 

--
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Elec. Eng. Dept, Aristocrat Technologies Australia
3rd Floor, 77 Dunning Ave Rosebery NSW 2018
Phone: (02) 9697-4484 Fax: (02) 9663-1412 Email: [EMAIL PROTECTED]
 


> -Original Message-
> From: James Wilkinson [mailto:[EMAIL PROTECTED]]
> come back
> to bite me today, so I really want to do soemthing like NIS, only not
> NIS.

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[SLUG] network card/RH7.1

[David]

I've just installed RH7.1 on an old box only to find that the old network
card was dead, so I installed a shiny new D-Link DFE-538TX. 

RedHat finds the card on boot, but it sets it up "driver disabled" and I
can't figure out how to get the darn thing to work. 

Kudzu happily sets up a generic entry for the card, but it doesn't install
any sort of driver for it, and the network won't start up.

network: bringing up interface eth0: failed

What am I doing wrong, or what should I be doing?

TIA, David.


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[SLUG] Network Card Error

[Michael]

Hello There,

I was just wondering if anyone can help me out with some info to why the 
below has happened and what i might do to fix it.

Problem,
A few days ago my Redhat 7.2 Server with kernel-2.4.7-10 suddenly stop 
responding , i couldn't ssh or connect to the server anyway. Once i 
rebooted it and checked the messages log file i found this error which 
also happened again 2 days later. 

ns1 kernel: NETDEV WATCHDOG: eth0: transmit timed out
ns1 kernel: eth0: Transmit timed out, status , PHY status 782d, resetting...
ns1 kernel: eth0: reset did not complete in 10 ms.
ns1 kernel: NETDEV WATCHDOG: eth0: transmit timed out
ns1 kernel: eth0: Transmit timed out, status , PHY status 782d, resetting...
ns1 kernel: eth0: reset did not complete in 10 ms.


Any ideas what might be going on or how to fix it.


-- 

'C' ya ...

Regards Michael


Australian WebWizards
Ph: (02) 9540 9605
Fax: (02) 8572 6023
Mobile: 0408 477 525


Your Ecommerce, Web Design & Hosting Specialists

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Re: [SLUG] network monitoring

[Graeme Robinson]

On Sun, 7 Jul 2002, Adam Hewitt wrote:

> Hi,
> 
> is there a 'standard' tool for network monitoring, ie. who's connected, 
> what the speed is on the ISP connection, who is pulling traffic and how 
> much, load, etc. If there isn't a standard one could someone give me some 
> ideas about some good utils??

netstat is a good place to start but requires quite a bit of practice to 
be useful.  There is a gui version in redhat (netmonitor?).

A good way to search for what tools you might have is:
man -k net (searches the manuals for programs with net in them)



-=-=-==-=-=--=-=-=-=-=-=-=-=-=-=-=-=
Graeme Robinson - Graenet consulting
www.graenet.com - internet solutions
-=-=-=-=-=-=-=-=-=-=-==---=-=--=-=-=


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Re: [SLUG] network monitoring

[Malcolm V]

On Sun, 2002-07-07 at 20:25, Adam Hewitt wrote:
> Hi,
> 
> is there a 'standard' tool for network monitoring, ie. who's connected, 
> what the speed is on the ISP connection, who is pulling traffic and how 
> much, load, etc. If there isn't a standard one could someone give me some 
> ideas about some good utils??

I find ntop quite useful for a lot of the above.

Cheers,
  Malcolm V.

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Re: [SLUG] network newbie

[Crossfire]

Nick Croft was once rumoured to have said:
> I have `old_box' with a dialup ISP which I'm still using for mail etc, 
> and `new_box' onto which I'm slowly ftp-ing what I want to keep.
> 
> Naive question is, what sort of configuration I need to do to connect 
> new_box to the net? Would it involve route -add host gw ?

if you want to use old_box as a router/gateway...

You need to configure old_box with a either a 2.2 kernel with ipchains
and Masquerading, or with a 2.4 kernel with iptables and full NAT
support.

You'll need to tell old_box to not forward everything, and to masquerade/NAT 
connections from your subnet to the world.

> new_box is 172.16.4.1
> old_box is 172.16.4.2
> 
> Would it go like:
> 
>   /sbin/route add -host ISPnumber gw 172.16.4.2

NO NO NO NO NO!

On new_box, you'd do a:
  /sbin/route add default gw old_box

This tells new_box that it needs to contact old_box to get to places
it doesn't have an explicit route for. 

> and would I have to change this each time I dialup depending on the 
> remote address I get from the ISP ?

No.  Because old_box gets the IP data dynamically, and new_box doesn't
need to know that much detail.

> I don't want to blow anythin up, which is why I'm asking first. 

There are MANY HOWTOs and FAQs on the subject.  Look for Linux +
Masquerade.

C.
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Re: [SLUG] network newbie

[DaZZa]

On Tue, 27 Feb 2001, Nick Croft wrote:

> I have `old_box' with a dialup ISP which I'm still using for mail etc, 
> and `new_box' onto which I'm slowly ftp-ing what I want to keep.
> 
> Naive question is, what sort of configuration I need to do to connect 
> new_box to the net? Would it involve route -add host gw ?
> 
> new_box is 172.16.4.1
> old_box is 172.16.4.2
> 
> Would it go like:
> 
>   /sbin/route add -host ISPnumber gw 172.16.4.2

Nope, this will not work.

Since you are using private {non-routable} Ip addresses on your internal
network, you have to do IP Masquerading on your outbound interface.

If you've never done this before it can be somewhat interesting to setup -
wiser heads than mine can help with that.

> and would I have to change this each time I dialup depending on the 
> remote address I get from the ISP ?

Nope - once you get Masquerading setup, you set your old_box as the
gateway {route add default 172.16.4.1} and just let the other box handle
it. The masquerading script should handle all changes required.

DaZZa


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[SLUG] Network Server Identification

[Craige McWhirter]

Afternoon. I'm after a quick'n'easy tool to identify how many servers we
have running Debian across our network so I can gather numbers for a
case I'm putting together. Does anyone have nice and simple apps I can
suck down and use?

-- 

Cheers,
  Craige.

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[SLUG] Network Issues SuSE7.0

[D.V.Rogers]

I have two SuSE 7.0 boxes running and cannot figure out why I cannot see each
other when I use Kruiser-the alternative file manager

i can ping and telnet between both boxes but cannot see each other through a gui
any pointers anyone?

any suggestions on where to find some good recommended online documentation for
networking linux?

cheers all
simple dave

  -- 

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email [EMAIL PROTECTED]
D.V.Rogers



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[SLUG] network/application monitor

[MD]

Does anybody know of an application and network monitor??
I need something that can keep a log of ping requests, http, ssh, jsp, db
requests, etc.

I have tried using Big Brother and it works well exept I want to be able
to keep detailed logs of service monitoring. BB just gives a status time.
:(

Does anybody know of something that could do this, commercial or
otherwise.

Thanks in advance.

--M


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[SLUG] Network card trouble

[Robert Martinovic]

Hey,

I am starting to have some serious problems with my network card. It
basically works and then it doesn't. I do know that it is a software
not hardware problem.

* Some info on the card - from /proc/pci:

  Bus  2, device  12, function  0:
Ethernet controller: 3Com Corporation 3c905C-TX [Fast Etherlink]
(rev 120).  
  IRQ 11. 
  Master Capable.  Latency=64.  Min Gnt=10.Max Lat=10.
  I/O at 0xec00 [0xec7f]. 
  Non-prefetchable 32 bit memory at 0xfbfffc00 [0xfbfffc7f].

* My Kernel:

Linux versteht 2.4.5 #1 Sat Jun 9 15:58:48 EST 2001 i686 unknown

* Some weird errors I've seen after connecting to the net (via ppp) -
  from /var/log/messages:

Jun 11 12:20:15 versteht kernel: IN= OUT=ppp0 SRC=203.54.250.124
DST=139.134.5.51 LEN=62 TOS=0x0
0 PREC=0x00 TTL=64 ID=17095 DF PROTO=UDP SPT=1065 DPT=53 LEN=42
Jun 11 12:20:15 versteht kernel: IN= OUT=ppp0 SRC=203.54.250.124
DST=139.134.2.18 LEN=62 TOS=0x0
0 PREC=0x00 TTL=64 ID=17095 DF PROTO=UDP SPT=1065 DPT=53 LEN=42
Jun 11 12:20:15 versteht kernel: IN= OUT=ppp0 SRC=203.54.250.124
DST=139.134.5.51 LEN=62 TOS=0x0
0 PREC=0x00 TTL=64 ID=17095 DF PROTO=UDP SPT=1065 DPT=53 LEN=42

* This is something I see on bootup:

COnfiguring network interfaces: eth0: using NWAY device table, not 8

* And finally - ifconfig output:

eth0  Link encap:Ethernet  HWaddr 00:B0:D0:35:61:67
  inet addr:192.168.1.1  Bcast:192.168.1.255
  Mask:255.255.255.0
  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:51 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:100
  RX bytes:0 (0.0 b)  TX bytes:7056 (6.8 Kb)
  Interrupt:11 Base address:0xec00

Any help would be appreciated, as I have a house full of people who
can't access the net because it ALL comes through my machine

Rob

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Re: [SLUG] network manager files

[Tony Sceats]

I would guess IP addresses in decimal form, and a netmask in CIDR
Unsure about the negative one though - I suppose an IP could turn out
negative with signed integrers, not sure though

On Sun, Apr 12, 2009 at 1:57 PM, david  wrote:

> I'm trying to debug a networkmanager problem. I've found this xml file:
>
> ~/.gconf/system/networking/connections/1/ipv4/%gconf.xml
>
> Can anyone help with interpreting the address values? I'm especially
> curious about the negative one :-)
>
> thanks...
>
> David.
>
> 
> 
> ltype="string">
>
>kenpro.com.au
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>manual
>
>
>ipv4
>
> 
> ipv4/\%gconf.xml (END)
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Re: [SLUG] network manager files

[Andrew Cowie]

On Sun, 2009-04-12 at 13:57 +1000, david wrote:
> I'm trying to debug a networkmanager problem.

What version of NetworkManager are you running, on what distro, etc?

And, in all consciousness, the connection editor GUI is fairly
comprehensive; what is its UI presenting for this connection? 
What does the CLI `nm-tool` tell you about the connection?

[Trying to infer things from an application's stored internal
representation is almost never the right idea. Admittedly your negative
number does indeed seem peculiar, but really it is meaningless until it
has been loaded and interpreted by nm to mean whatever it means to nm]

Or, just read the source code to find out how what it is serializing
from in writing this field.

AfC
Sydney



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Re: [SLUG] network manager files

[James Gray]

On 12/04/2009, at 1:57 PM, david wrote:

I'm trying to debug a networkmanager problem. I've found this xml  
file:


~/.gconf/system/networking/connections/1/ipv4/%gconf.xml


SNIP


"routes" mtime="1236774478" type="list" ltype="int">
   
   ltype="int">

   
   


Well, 1814304715 in binary is 01101100 00100100 00010111 11001011  
which when you convert the grouping of four into a dotted series of  
octets you end up with 108.36.23.203 - which may or may not be  
relevant to your network, I'm just guessing that the integer addresses  
are the integer representation of the binary for the IP addresses ;)




   
   


My guess is this is the number of bits assigned to the network - in  
other words, the netmask is 255.255.255.0 (or /24 in CIDR notation)




   
   


Again, assuming this is an integer representation of the binary (and  
assuming 2's compliment) we end up with 254.36.23.203 (after ignoring  
the highest 32 bits which are all ones) - which looks like a multicast  
address.  I have no idea if this is how things work in Gnome world,  
but it was fun to blow the cobwebs off my binary arithmetic on a long  
weekend!


Cheers,

James

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Re: [SLUG] network manager files

[Patrick Lesslie]

On Sun, Apr 12, 2009 at 04:14:01PM +1000, James Gray wrote:
> On 12/04/2009, at 1:57 PM, david wrote:
>
>> I'm trying to debug a networkmanager problem. I've found this xml  
>> file:
>>
>> ~/.gconf/system/networking/connections/1/ipv4/%gconf.xml

SNIP

>>
>>
>>
>
> Again, assuming this is an integer representation of the binary (and  
> assuming 2's compliment) we end up with 254.36.23.203 (after ignoring  
> the highest 32 bits which are all ones) - which looks like a multicast  
> address.  I have no idea if this is how things work in Gnome world, but 
> it was fun to blow the cobwebs off my binary arithmetic on a long  
> weekend!

It was a good guess ... if you reverse that IP, it belongs to the
original poster.  :-)

Patrick

>
> Cheers,
>
> James

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Re: [SLUG] network manager files

[david]

Andrew Cowie wrote:

On Sun, 2009-04-12 at 13:57 +1000, david wrote:

I'm trying to debug a networkmanager problem.


What version of NetworkManager are you running, on what distro, etc?



Ubuntu 8.10


And, in all consciousness, the connection editor GUI is fairly
comprehensive; what is its UI presenting for this connection? 
What does the CLI `nm-tool` tell you about the connection?




not enough. The UI differs from the xml file. I've had this type of problem 
before with NetworkManager. The last time, I couldn't persuade it to remember a 
search domain (correct in the UI but NetworkManager failed to update 
resolv.conf), although that suddenly and inexplicably started to work so maybe 
it was a bug that got fixed in an update? In this case, I'm having trouble with 
IP number allocation and strange DNS lookup failures, so I thought I would try 
to debug it myself. NetworkManager does not encourage this approach. If you do 
"man networkmanager" you will see what I mean. In the "Good Old Days" (tm), 
everything was pretty much in /etc/network/interfaces. I guess life is more 
complex now ;-)




[Trying to infer things from an application's stored internal
representation is almost never the right idea. Admittedly your negative
number does indeed seem peculiar, but really it is meaningless until it
has been loaded and interpreted by nm to mean whatever it means to nm]



black box approach? perhaps I should change to windows?



Or, just read the source code to find out how what it is serializing
from in writing this field.



Sadly I am not able read the source code... although that would be a nice idea.

For the record, the sample xml file comes from a box that works perfectly. The 
one I'm debugging is at work and I didn't have immediate access to it.


Meantime, I can't see what's wrong with adding to my store of knowledge.
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Re: [SLUG] Network Mapping tool

[Jamie Wilkinson]

This one time, at band camp, Peter Rundle wrote:
>Sluggers,
>
>I'm looking for a tool like Cheops that will trace out my network and draw 
>a pretty picture of the nodes, their OSes and the services they are running 
>etc.
>
>I tried to download and compile Cheops but it's not being maintained and 
>the number of compile errors looks like a hard road.
>
>Any suggestions for alternatives?

UNfortunately, not really.

There's nmap, which is very very cool but no clicky clicky.  It does
produce XML output so there's an opportunity for something to piggyback
on it.  I don't know of any tools that do this though.

However, I'm currently writing a frontend for Nagios for great justice,
and the topic of automatic network scanning and monitoring interests me,
so I may just well add nmap support to this tool.

I'll remember to post here when I've got something useful to
demonstrate.

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Re: [SLUG] Network Mapping tool

[Robert Collins]

opennms may do what you want.

Rob

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Re: [SLUG] Network Mapping tool

[James Gregory]

On Wed, 2004-04-21 at 16:58 +1000, Jamie Wilkinson wrote:
> This one time, at band camp, Peter Rundle wrote:
> >Sluggers,
> >
> >I'm looking for a tool like Cheops that will trace out my network and draw 
> >a pretty picture of the nodes, their OSes and the services they are running 
> >etc.
> >
> >I tried to download and compile Cheops but it's not being maintained and 
> >the number of compile errors looks like a hard road.
> >
> >Any suggestions for alternatives?
> 
> UNfortunately, not really.
> 
> There's nmap, which is very very cool but no clicky clicky.

But fortunately there was at least one other person who considered this
a problem. There's another program (the mandrake package is called
nmap-frontend) that provides you with a clicky-clicky interface to nmap.
nmap_fe was the binary name IIRC.

You are unfortunately still left with the problem of turning your xml
file into a graph. I don't have an easy answer for that I'm afraid.

HTH,

James.
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Re: [SLUG] Network Mapping tool

[norman]

Hi,

save the output from this script, Can take about an hour to run
but it might identify IP's. Ettercap can sniff around and is a nice
(ansi/screen/no-gui) utility. I hope this helps

cheers
Norm

LOGF="ettercap.log"
idx=0
until [ $idx -gt 255 ] ;
do
/usr/local/sbin/ettercap -NlH 192.168.$idx.1-255 2>&1 >> $LOGF
idx=$[ idx + 1 ]
done

/usr/bin/egrep "[[:digit:]]+\).*" $LOGF \
| /usr/bin/awk '{ print $2 }' \
| /usr/bin/sort -u



On Wed, 21 Apr 2004, Peter Rundle wrote:

> Sluggers,
>
> I'm looking for a tool like Cheops that will trace out my network and draw a pretty
> picture of the nodes, their OSes and the services they are running etc.
>
> I tried to download and compile Cheops but it's not being maintained and the number 
> of
> compile errors looks like a hard road.
>
> Any suggestions for alternatives?
>

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