I don't know any Java but standard UNIX sockets allow a non-blocking
connect. Thus you don't care what the underlying stack is doing, you
just time-out at the application layer.
rgds
Marc
John Neiberger wrote:
One of our programmers is asking me about this and I really don't have an
answer.
Bill,
I've just done four this evening, I used the technique shown here:
http://www.cisco.com/en/US/products/hw/routers/ps233/products_tech_note09186a00800941aa.shtml
or http://www.cisco.com/warp/public/471/13.pdf
rgds
Marc
Scott Roberts wrote:
I can honestly say that I've never upgraded my
modest to mention it, but you're best bet for a design
education
is from Priscillas book.
its well worth twice the price (twice the discounted bookpool price that
is!! ;)).
scott
Marc Thach Xuan Ky wrote in message
news:[EMAIL PROTECTED]
Hi all,
I thought I'd do 640-025 CID before
Hi all,
I thought I'd do 640-025 CID before it disappears, so I started reading
the Ciscopress book, CID exam certification guide. Now in chapter 2,
section Issues facing campus LAN designers (I'm using Safari books
online so I don't know the page number) it shows figs 2.4 and 2.5
distributed and
This is all very well but sometimes when people write 500 they really
mean 512, so where does that leave you ?8-)
Marc
s vermill wrote:
Here's a perfectly illustrative example of how common it is to jumble all
this terminology up...
I often use a download test site at PC Pitstop:
When you run your hand across the keyboard, do you touch it or is this a
psychic thing :-)
I'd check the parity on your terminal. It may be setting the wrong
parity for the router but ignoring incorrect received parity.
Marc
Jim wrote:
I recently acquired a used 2501 router for my home lab
Not to mention that a TR card goes through a lobe test before attempting
insertion into the ring. The lobe test is effectively a loopback at the
MAU, a crossover cannot do this.
rgds
Marc
Priscilla Oppenheimer wrote:
ha wrote:
hi
can 2 token ring interface direct connected with a crcoss
Dwayne,
it's most likely that any NAT implementation would overwrite the header
data that it wishes to change, rather than rewrites the header in its
entirety. Of course the end result would look the same when you view
the packet, however you can recalculate the checksum from the old and
new IP
I've found that it's useful to have a variety of kit, and as many
routers as possible. Cisco prices on eBay have fallen through the
floor. A 4000 series with NP-4Ts is a good frame switch. 2500 are good
workhorses, best to get one with an ISDN BRI (I didn't and regretted
it). Once you have a
Doug,
I used the term horrible kludge several hours before I saw your post.
The multiple NAT pool kludge is horrible because it is neither scalable
nor maintenance-free, nor does it include any dynamic distribution of
load across the resultant multiple (outside local) addresses in use. It
almost
IIRC when I last looked at this, it worked as you require, but that
might have been v2 NAT rather than v3 which is current. Have you
restarted the router, superstition dictates that you should. Failing
this, how many app servers are there? You *could* use multiple NAT
pools, which would
This is hardly earth-shattering news. You can see this happening every
time you sniff a LAN. Empty TCP segments (e.g. acks) with six bytes of
random data. The only thing the report points out is that the data
may previously have been used on another interface or it may be other
non-network
I have used the Sybex virtual trainer, which was OK for Routing but not
so helpful for BCRAN. I haven't used the other two subjects yet. You
should note that it is designed to accompany the Sybex books, so if you
are not buying those then it is less helpful. If you are cash-strapped
and want a
I've just configured dot1q on a 4500 with NP6E and IOS 12.2, I haven't
tested whether its working.
rgds
Marc
Francisco Sedano/Inf-Pronet wrote:
4000? Could you expand on it? Which model/IOS? I have a plain 4000 with
12.1(11) and it doesn't support it..
cebuano
Enviado por: [EMAIL
MTU 1500 means that the network layer datagram size is 1500 max. For IP
this is the IP datagram including IP header and transport (TCP/UDP)
header and data. Fragmentation occurs at the IP level and only the IP
header is duplicated (except offset, checksum etc) into each fragment.
The TCP/UDP
Thanks Mark,
I get it now I think. I was envisaging processes remaining in the queue
and a pointer selecting each in turn. In fact of course, because it's
not a pre-emptive OS, this doesn't occur, the processes are removed (as
in fact stated in the book) and put on either the idle or dead queue.
Well I thought the site was very slow - until I realised I'd stuck a
clock rate 64000 on my frameswitch router so that I could see some
queueing :-) I now go straight for the search button, but there are some
horrors in there. There seem to be more pdfs as well which is good, but
then sometimes
Hi all,
I am reading Cisco Press Inside Cisco IOS Software Architecture and
have some outstanding questions about the scheduler, maybe somebody can
help me. The text describes how the low priority queue is only skipped
15 times before it is serviced even when there are processes queuing at
higher
In the last place I worked, rumour has it that one of my colleagues was
interviewed and thus obtained a UK visa on the basis of his CCIE, and
this later turned out to be written only. HR departments / technical
management aren't always as rigorous as you may think :-)
If this is true then I think
Thomas Larus wrote:
snip
As for nrf, - his contributions to groupstudy have been almost entirely
negative. While it is helpful to have some discussion of things like the
job
market and the question of whether it is better to invest time and effort
in
a degree versus certification is useful,
Hi Phil,
I came across this link and thought it might be useful to you.
http://www.videolan.org/
rgds
Marc
Cisco Nuts wrote:
Hello,Is there a way to test/practise MCast configs. on the Internet? I
have a cable-modem connected to a 2514 router and would like to configure
MCast on it as well
A few points:
When I was fresh in the IT industry (over 20 years ago) the old-timers
who had been working maybe four years already would tell me that there
was no future in programming, after all they said, who uses a chauffeur
now that cars are so easy to drive?
Cars need very little maintenance
nrf wrote:
I would just add that many times (actually, more often than not,
predictions
actually turn out to be correct).
We could trade predictions forever :-) What about the bloke who said
nobody will ever need more than 640k RAM? He still got rich.
And even for those jobs that didn't
Are you trying to make the window smaller?
rgds
Marc
s vermill wrote:
On a W2k machine, I've tried several different recommendations for
adjusting
the TCP receive window size. None of them, including those directly from
Microsoft, seem to have any impact. I'm capturing my own traffic and
wrote:
Marc Thach Xuan Ky wrote:
Are you trying to make the window smaller?
rgds
Marc
Yes. I was hoping to set up a demonstration on the impact of high
bandwidth*delay product networks without actually having a high
bandwidth*delay product network. By artifically enforcing a small
-
From: s vermill [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, 18 December 2002 6:40 AM
To: [EMAIL PROTECTED]
Subject: Re: Perhaps O/T: Window TCP Rcv Window [7:59400]
Marc Thach Xuan Ky wrote:
Are you trying to make the window smaller?
rgds
Marc
Yes. I was hoping to set up
IIRC when you use route-maps you should note that the NAT is
session-based (like with twice-NAT) with various consequences:
you cannot make new connections into the inside global address
without NAPT (PAT) you may use your pool addresses rather quicker than
you envisaged
rgds
Marc
The Long and
Sounds like a standard IEC kettle lead to me. At least here in the UK,
thats what they're for, electric kettles. IIRC these plugs are used for
temperature-resistant leads, and the notch allows you to use a
temperature-resistant lead in any application, but to disallow the
incorrect lead in your
Hi Priscilla,
At the end of the slideshow you ask for other methods, well I've got one
and it's really easy. Before I start you should note that my emoticons
have broken down so you may need to insert your own.
Unfortunately my first attempt to implement the method that I'm about to
describe was
Hi Cable,
A normal PC serial port is async, as in U.Async.R.T, so will not connect
to standard sync cisco port. If you really want to run sync then yes,
you will need a sync port on the PC but this is minority interest
hardware and will not be cheap. Try manufacturers such as Eicon. I
would
Am I being thick or something, isn't this what Windows dial-up
networking is for? or *NIX pppd? Alternatively, what about some pre-MS
stack for Windows or DOS ?8^)
rgds
Marc TXK
Cable Guy wrote:
The fact that you can dial into the Internet is more proof that you can
run
TCP/IP over the PC's
?
BTW, how do you program your video? Have you ported QNX to it yes?
Regards,
Dom Stocqueler.
Marc Thach Xuan
Ky
cc:
Sent by: Subject: Re: build
tcp/ip on PC serial port [7:56885]
[EMAIL PROTECTED
Hi Greg,
Where about in London are you? I'm in SE14 and would certainly be
interested in forming a local group.
rgds
Marc TXK
[EMAIL PROTECTED]
Greg Nathan wrote:
Hi
Anyone in London, UK want to form a study group where we can bounce around
a
few ideas and lab practise strategies? I have a
Priscilla Oppenheimer wrote:
What will it be when we're old geezers that we won't get? There will
probably be some technology that the young people all get that we will be
clueless about. I won't like that. ;-)
Wot? do you mean you can you work the video?
rgds
Marc TXK
Message Posted
Hi,
I had a very similar message, I changed the cache and main RAM, but I
just got different error messages. I concluded that I had a bad
backplane. However, I swapped around the NP modules, and it's been
working fine since
rgds
Marc
nettable_walker wrote:
Thank you
I already swapped
The ICMP type specified is not related to either source or destination
address. It is not like a port, it is just the type of frame. You
could ask why the syntax is not:
permit icmp echo any any
It just isn't, possibly for historical reasons, maybe just arbitrary.
More to the point, why do
Hi Trevor,
Assuming that your servers have unique public IP addresses and you can
get a small new address space from the colocation provider (for use as a
NAT pool) then this would be technically feasible using twice-NAT.
However, you would be paying your current colo provider for twice the
Some time ago I was messing about with a 3640 and IIRC I measured about
70k pps (unidirectional traffic) with no acls. An acl where the traffic
was permitted on the first line dropped it to about 55k pps. Pushing
the permit acl lines down the list dropped another approx 1%
throughput for each
The last time I looked, a Cisco router would send an ICMP
administratively unreachable message when an access list blocked a
packet. What the source host does with that is not up to the router.
Marc
Dimitris Vassilopoulos wrote:
Team,
I was wondering
Is it possible to make a router
Joel,
Start with a management summary which includes a statement that it will
save your business X thousand creds per year, recouping capital and
manpower implementation costs within Y months. Then write a load of
blurb to prove it. Job done. Remember to think business, not
technical, and that
Timing was my first reaction, but this whole thing may not be a good
idea anyway. If you cannot stop the TCP connection establishment, then
blocking further access is pretty futile. Anyone who can telnet to you
could also put up an SMTP server of their own or script a session. I
think that
I guess then when you are writing a parser for a compiler then it helps
if all numeric constants start with a numeric.
Marc
Wes Stevens wrote:
We need to find an old ibm'er for that answer I think. I know that 0x has
been used on ibm systems since before cisco made it's first router.
I just tried this and it worked OK, but it needed a default route to the
outside. I also tried it making the inside network routed rather than
connected, and it still worked. I think that IOS 11.2 and earlier won't
work. You have to set up a translation from one direction before you
have a
I have to eat my words in public! I just had a go (IOS 12.0) at the
overlapping NAT example from the Cisco BCRAN book, and after minor mods,
the config worked like magic. The outbound packets were indeed routed
before the destination address was known, incredible.
Marc
Marc Thach Xuan Ky wrote
would be if the router were to
connect between same Layer2 networks ie say both
networks are ethernet. right ? just want to make
sure...
--- Marc Thach Xuan Ky
wrote:
Sam,
I think the question is: what is your average packet
size? Using
process or fast switching I should think
Have you got a route to the pool?
Marc
george wrote:
I having problems staticaly translatinga server to the outside world , bu=
t
looking at my config is their somthing im misssing=0D
=0D
=0D
ostname Router=0D
!=0D
logging buffered 8192 debugging=0D
enable secret 5
1. Because its 64000 bps, built by humans, not computer memory.
3. huh? Note that if you earn 50k you will get 5 (less tax)
Marc
Ellis Lam wrote:
Two Qs,
1. in FR, when we specify clock rate for 64k, we use clock rate 64000, why
not 64 x 1024 = 65536 ? and for 1.544 mbps, we use
ip address 192.168.3.1 255.255.255.0
ip nat outside
!
access-list 1 permit 10.1.1.0 0.0.0.255
Will it works?
-Original Message-
From: Marc Thach Xuan Ky [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 19, 2002 8:49 PM
To: Sim, CT (Chee Tong)
Cc: [EMAIL PROTECTED]
Subject
Hi Tong,
I've reread the BCRAN book. The example given of NAT overlap is when
the two real network spaces overlap, not when a pool overlaps with the
real space. I still don't see how this can work.
Marc
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=38932t=38764
Sam,
I think the question is: what is your average packet size? Using
process or fast switching I should think that the packet size is almost
irrelevant to the router. I have benchmarked many PCs and NICs running
certain routing software. On a PCI bus PC the pps difference between 64
and 1518
Hi Tong,
The second method you use is twice-NAT, both source and destination
addresses are converted. This does not work well on Cisco routers
unless all NAT entries are defined statically. This is sometimes a good
policy anyway where there are only a small number of known connections,
which is
Have you disallowed the printer address with an acl for the pool?
Marc
Zolla Zimmerman wrote:
Hi All,
I really have a problem. I have enabled NAT on the router. I am able to
reach all PCs but the printer. Here is the senario:
192.168.1.0
I was under the impression that some asian countries used the
numerically consistent notation y/m/d :-) This of course demonstrates
that the world is a big place with many different outlooks. We should
be able to accomodate them all and Tim is therefore free to put whatever
sig he likes at the
As far as I can tell this is another one of those Cisco quirks. Unless
Cisco plan for the future a mechanism whereby the route to the NAT pool
is dynamically advertised, then the subnet mask has no *real* function.
IMO while routes to the pool are statically defined and then redist, it
remains
A couple of months ago I bought some (non-approved) 8M flash for c2500
for $76 per SIMM (ouch). I couldn't write to them. I have now upgraded
to bootrom version 11.0(10c)XB2. I still can't write to them. The
SIMMs are marked SMART SM73228XV1CAVS0. Does anybody know whether these
modules
Have you tried Linux?
Marc
Johan Hjalmarsson wrote:
Does anybody know if there's any software out there to turn a PC into a
Cisco 2509?
What I need is the abillity to telnet to the PC and get the telnet traffic
redirected out a COM port, just like reverse telnet in the Cisco.
One solution
Bytes are not part of the OSI model until at least the presentation
layer (I can't remember whether there is an ASN1 byte datatype). Comms
engineers talk about octets but note that by the time we get down to
layer 2 we start to encounter techniques such as bit-stuffing, so a
frame may not even
Any decent ISP will refuse DNS recursion from any IP address that is not
within its own address space. This is fundamental to DNS security.
You need to rewrite the destination IP address. Note that Cisco's NAT
is not suitable for this because of the DNS ALG. The easiest thing to
do may be
cacheing DNS
server is almost always the best solution, but then I am biased since
DNS is my specialism :-)
rgds
Marc TXK
Priscilla Oppenheimer wrote:
At 12:28 PM 2/18/02, Marc Thach Xuan Ky wrote:
Any decent ISP will refuse DNS recursion from any IP address that is not
within its own address
Tim,
If you wish to provide authoritative DNS service from behind a NAT
router, then with a Cisco the NAT code contains various ALGs
(application level gateway I think) including one for DNS. This ALG
translates A records, MX and PTR records where it can. IIRC if it can't
then the response is
Hi all,
Can I run the normal web caching( for outbound traffic) and reverse proxy
caching at the same time on the same content engine?
Thanks
KY
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=16558t=16558
--
FAQ, list
and
even rebuild the PVC from their side.
Good Luck
KY
Raul F. Fernandez wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
CSICO routers prioritize the LMI packets so they will drop data frames
before LMI packets.
This was told to us by TAC.
Raul
-Original Message---
in the computer room, so you, to some extend on your boss mind, are
resposible for this.
KY
Sean Young wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
Come on guys. Everyone's point is very well taken. I am NOT saying that
a CCIE also has to be an expert with Unix. All I a
. The only
loosers are those who put money and time on their MCSE certification, I
donot see why CCIE won't be the second MCSE, sooner or later, that day will
come, seems to me it is just a matter of a year or two.
KY
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=12748t=12748
it, I am pretty sure about that.
Just my .02.
KY
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=12750t=12750
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Report misconduct
Geeze!! Why not? I guess they already had this on mind when deciding to
cut their own 15900 Lambda router. Now it makes more sense.
Kent
Circusnuts wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
Geeze !!! Why !!!
Phil
- Original Message -
From: Natasha
To:
Sent:
Noted the officials from both companies declined to comment, it is so
obviouse to me that they must be doing something.
Kent
hal9001 wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
They have a pretty poor history as a defence contractor though. They
managed to squander
lamdarouter, cisco will loose its core market forever.
I have heard some big carriers are replacing their GSR with Juniper, if
Juniper can use their credit and make some solid optical routers, the rest
of market will be shared by Lucent, Nortel and some others, there is no
place for cisco at the core.
KY
Not any more, if it was one.
Why you guys just could not ignore those trash, this is not the first one
and simply will not be the last.
ElephantChild wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
On Tue, 29 May 2001, Jim Bond wrote:
UNIX guys,
I make $240K per year,
l router design, which I
think is more appropriate.
KY
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=6160t=6151
--
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Report misconduct and Nondi
orld two years means what.
Just read all those RFCs/Drafts since late 1999.
I believe MPLS will play a key role in the optical world, such as DWDM.
KY
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=6161t=6151
--
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opinion.
KY
NRF wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
So are you saying that what Radia wrote is outdated and that MPLS is
indeed
significantly faster than straight IP forwarding? Bill St. Arnaud and
Howard Berkowitz would emphatically disagree with that, so c
Peter,
The difference is Juniper's IS-IS has TLVs( metric wide-only) enabled by
default.
KY
Peter Van Oene wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
Ahh, thanks for the insight. I didn't realize that was the case. My MPLS
experience is restricted to
Pity I will not be able to make it. Have to take a test in the morning and
have my tires replaced in the afternoon. Got I coupon from the garage and
have to use it before this weekend.
Have a fun!!
KY
Bruce Evry wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
Dea
Peter,
People looking for Olive donot expect any support from Juniper in any sense.
I remember some guys on the list use LS120 on FreeBSD to boot JunOS, I never
tried it myself.
KY
Peter Van Oene wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
JunOS is only intended
I would imagine the icmp timeout value is worth more concern.
It does not hurt if the TTL set to infinite, does it?
Chuck Larrieu wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
I would imagine that the TTL is in inverse proportion to the number of
hawks, owls, eagles, or
I think you may want to stay away from Qwest, ATT seems not too bad
sometimes.
But, IMO, just different extend of pain most of the time for all those big
names, especially if you are a tiny little customer.
Just my two cents.
Good Luck
KY
""BH"" wrote in message
[EM
be appreciated.
I could not find any thing from FreeBSD sites, any input would be helpful.
Thanks
KY
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=1303t=1303
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ways like uses xxx and xxx uses xxx.
I bet most of people, especially who works for ISPs but not at the top
level, would pay their money for.
Just my 2 cents.
KY
""Howard C. Berkowitz"" [EMAIL PROTECTED] wrote in message
news:p05001902b6ea44b7d429@[63.216.127.10
kind encryption
before sending out any traffic.
Just my 2 cents.
HTH
KY
""Roberts, Timothy"" [EMAIL PROTECTED] wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
I have some customers that need to be connected to my network. They
insist
on not ha
Sean,
Have you guys compared FreeBSD with Linux for the firewall?
Thanks
KY
""Sean Young"" [EMAIL PROTECTED] wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
Ken,
Thank you very much for the advice. This past Friday, my company has
decided to use L
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