Re: [LARTC] Ethernet packet loss - frame errors

[Stephen Hemminger]

On Fri, 13 Oct 2006 10:26:14 +0200
Justin Schoeman <[EMAIL PROTECTED]> wrote:

> Hi all,
> 
> I have the following problem. A Linux box configured as a bridge. One 
> interface connects to the router via a crossover cable, the other 
> connects to a switch via the cable that used to go to the router.
> 
> Now I get the following:
> 
> [EMAIL PROTECTED] net]# ifconfig eth3
> eth3  Link encap:Ethernet  HWaddr 00:03:2D:07:61:5D
>UP BROADCAST MULTICAST  MTU:1500  Metric:1
>RX packets:1969134 errors:0 dropped:0 overruns:0 frame:176459
>TX packets:2186662 errors:0 dropped:0 overruns:0 carrier:0
>collisions:0 txqueuelen:1000
>RX bytes:492595115 (469.7 Mb)  TX bytes:579725462 (552.8 Mb)
>Interrupt:17
> 
> eth3 is the interface that connects to the switch.  As you can see, 1 in 
> 10 rx packets are framing errors.
> 
> What are possible causes for this? The cable is a constant, so is not 
> likely to cause problems, so what else can possibly cause such a high 
> number of frame errors?
> 
> Any help appreciated.
> 
> Thanks,
> 
> Justin
> 

What speed and driver?
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Re: [LARTC] HTB has 2 bucket?

[Martin A. Brown]

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Greetinsg Thossapron,

 : in HTB use 2 bucket for manage 2 rate??? first bucket -> keep 
 : token for sending with rate second bucket -> keep ctoken for 
 : sending with ceil rate Is it true?? may be i'm misunderstand 
 : about token/bucket thoery

Yes, there are two different buckets used.  One bucket is for 
tokens, another bucket is for ctokens.  Brief picture of 
association of parameters:

  rate:  burst, tokens
  ceil:  cburst, ctokens

See the upper right corner of this diagram [0].  In particular, I 
should warn you that the SFQ qdisc in this diagram is the one which 
is granted the dequeue opportunity, so although packets mostly flow 
from left to right in this diagram, the SFQ is displayed to the left 
of the HTB rate/ceil buckets, even though logically this is 
reversed.

Good luck,

- -Martin

 [0] http://linux-ip.net/traffic-control/htb-class.png

- -- 
Martin A. Brown
http://linux-ip.net/
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[LARTC] HTB has 2 bucket?

[Thossapron Apinyapanha]

in HTB use 2 bucket for manage 2 rate???
first bucket -> keep token for sending with rate 
second bucket -> keep ctoken for sending with ceil rate
Is it true?? may be i'm misunderstand about token/bucket thoery___
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[LARTC] HFSC question??

[Thossapron Apinyapanha]

1.  HFSC have 4 curve such sc, rc, ls, ul and
1.1 In leaf class can specify rc for guarantee service (bandwidth and delay) 
and If want to sharing fairness exceess service, we must specify ls and ul curve too
(ls curve with paramater m2 specify at lease sharing bandwidth in that class will receive and
ul curve mean maximum bandwidth in that class will receive)
so i'm doubt .. about if i specify sc curve in leaf class too,  what 's it mean??
rc, ls, ul + sc -> what's it mean?
rc + sc -> what's it mean?
 
In interior class can't specify rc curve but we can specify ls curve for doing link-sharing criterion
and can sharing fairness excess service too.
but so if i specify sc curve in leaf class too,  what 's it mean?? like
how different if i specify  "ls, ul and sc" and "ls, ul"???
 
In root class,  what is it mean if i specify

sc -> what's it mean?

ls +ul -> what's it mean? 
1.2 so can i conclude ls, ul, rc are subset 's sc curve.
and in each curve we can calculate banwidth and delay bound .?
because all 4 curve have same parameter such m1 ,d , m2
 
2. i read a lot of HFSC paper about paramter (m1,d,m2)
some paper tell me ... d is interval time 
(first will sending with m1 rate but after interval d parameter, it will change
rate to m2) 
but some paper tell me .. d is delay bound in that class 
(first will sending with m1 rate but when after exceed delay bound,
it will change rate to m2)
what 's it true??
2.1  if d are interval time so how HFSC calculate delay?
2.2  Is it true? -> "delay bound calculation from service curve"
 
3. this is my big problem with HFSC thoery ...
in HFSC has 2 criterion such real time and link-sharing criterion
so when packet coming in traffic control linux box
hfsc will checking eligible time in each packege
If eligible time < t 
(i'm don't understand how eligble working or how it classify eligible package or not?) 
or it's package that dangerouse for exceed deadline time
so it manage package with "real time criterion" and choosing
package with lowest deadline time for dequeue
 
but if it's not, it will manage with "link sharing criterion" 
and choosing package with lowest vertual time 
(this is a big don't unstand why choose lowest vertual time?
because it's mean class with have lowest will choose to dequeue
and what about another class that vertual time are now low??
how it can manage???
and i don't understand why must choose lowest not max vertual time?
Is it relative with fairness excess service all class?
 
4. my lab... i found bandwidth allocation by HFSC
comparation with HTB ... found 
At first time that class starting up, HFSC will receive banwidth nearly 
upperlimit rate nomatter in that time have a lot class active
(it's like can send with burst rate in HTB)
so comparation with HTB, 
At first time that class starting up, HTB receive bandwidth not peak like
burst but it use interval time for increase bandwidth until start with rate and then with ceil.
 
5. i read a lot of HTB 's tc command case, with try to test burst situation ,
i don't know why burst parameter their specify not much like 12kbit 
(but rate and ceil rate are so different from 12kbit such 200kbit  
so i will follow them,, but after plot graph  i don't see burst characteristic
at first time class active ...
Is i'm wrong to use burst paramter value 12 kbit it's too small?
are
 
 
5. from my lab 
 
 
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[LARTC] load balancing

[Indunil Jayasooriya]

try this echo "11 line1" >> /etc/iproute2/rt_tablesecho "12 line2" >> /etc/iproute2/rt_tablesip route add

1.2.3.0/29 dev eth0 src 1.2.3.6 table line1ip route add default via

1.2.3.5 table line1ip route add 192.168.6.0/24
 dev eth1 src 192.168.6.4 table line2ip route add default via 


192.168.6.254 table line2ip rule add from1.2.3.6 table line1ip rule add from 

192.168.6.4 table line2ip route add default scope global nexthop via 1.2.3.5 dev eth0 weight 1 nexthop via 
192.168.6.254 dev eth1 weight 1pls change ips accordingly. and add these to rc.local
 file-- Thank youIndunil Jayasooriya

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Re: [LARTC] Ethernet packet loss - frame errors

[Justin Schoeman]

Andrei Sandu wrote:

Possibly the length of the cable ?


It is a 5m cable.  It is also the 'common' cable - it is unplugged from 
the router and plugged into the bridge (the other side stays in the switch).


-justin


On 10/13/06, *Justin Schoeman* <[EMAIL PROTECTED] 
> wrote:


Hi all,

I have the following problem. A Linux box configured as a bridge. One
interface connects to the router via a crossover cable, the other
connects to a switch via the cable that used to go to the router.

Now I get the following:

[EMAIL PROTECTED] net]# ifconfig eth3
eth3  Link encap:Ethernet  HWaddr 00:03:2D:07:61:5D
   UP BROADCAST MULTICAST  MTU:1500  Metric:1
   RX packets:1969134 errors:0 dropped:0 overruns:0 frame:176459
   TX packets:2186662 errors:0 dropped:0 overruns:0 carrier:0
   collisions:0 txqueuelen:1000
   RX bytes:492595115 ( 469.7 Mb)  TX bytes:579725462 (552.8 Mb)
   Interrupt:17

eth3 is the interface that connects to the switch.  As you can see, 1 in
10 rx packets are framing errors.

What are possible causes for this? The cable is a constant, so is not
likely to cause problems, so what else can possibly cause such a high
number of frame errors?

Any help appreciated.

Thanks,

Justin

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[LARTC] load balancing

[Indunil Jayasooriya]

http://www.linuxquestions.org/linux/answers/Networking/Spanning_Multiple_DSLs-- Thank youIndunil Jayasooriya


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[LARTC] Non-classful per source capping

[Andrew Hall]

Hello,
 
I've been looking for a kernel implementation of 
simple bandwidth capping that will allow simple per (source) IP based 
bandwidth capping without the overheads associated with something like classful 
HTB. I have been unable to find anything exising that does this. In principle 
I'd like the code to dynamically setup a bucket/hash per source IP, monitor 
and cap an absolute ceiling. I have no need for sharing or guarantees of assured 
rates, just the simple cap per source.
 
Can anyone please point me to any existing 
implementation or point me to some code that I can refactor to do what I need if 
you know of any.
 
Thanks,
 
Andrew.
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Re: [LARTC] Ethernet packet loss - frame errors

[Andrei Sandu]

Possibly the length of the cable ?On 10/13/06, Justin Schoeman <[EMAIL PROTECTED]> wrote:
Hi all,I have the following problem. A Linux box configured as a bridge. Oneinterface connects to the router via a crossover cable, the other
connects to a switch via the cable that used to go to the router.Now I get the following:[EMAIL PROTECTED] net]# ifconfig eth3eth3  Link encap:Ethernet  HWaddr 00:03:2D:07:61:5D   UP BROADCAST MULTICAST  MTU:1500  Metric:1
   RX packets:1969134 errors:0 dropped:0 overruns:0 frame:176459   TX packets:2186662 errors:0 dropped:0 overruns:0 carrier:0   collisions:0 txqueuelen:1000   RX bytes:492595115 (
469.7 Mb)  TX bytes:579725462 (552.8 Mb)   Interrupt:17eth3 is the interface that connects to the switch.  As you can see, 1 in10 rx packets are framing errors.What are possible causes for this? The cable is a constant, so is not
likely to cause problems, so what else can possibly cause such a highnumber of frame errors?Any help appreciated.Thanks,Justin___LARTC mailing list
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[LARTC] Ethernet packet loss - frame errors

[Justin Schoeman]

Hi all,

I have the following problem. A Linux box configured as a bridge. One 
interface connects to the router via a crossover cable, the other 
connects to a switch via the cable that used to go to the router.


Now I get the following:

[EMAIL PROTECTED] net]# ifconfig eth3
eth3  Link encap:Ethernet  HWaddr 00:03:2D:07:61:5D
  UP BROADCAST MULTICAST  MTU:1500  Metric:1
  RX packets:1969134 errors:0 dropped:0 overruns:0 frame:176459
  TX packets:2186662 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000
  RX bytes:492595115 (469.7 Mb)  TX bytes:579725462 (552.8 Mb)
  Interrupt:17

eth3 is the interface that connects to the switch.  As you can see, 1 in 
10 rx packets are framing errors.


What are possible causes for this? The cable is a constant, so is not 
likely to cause problems, so what else can possibly cause such a high 
number of frame errors?


Any help appreciated.

Thanks,

Justin

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Re: [LARTC] Cant get transparent proxy to route out new ISP.

[Andrei Sandu]

You can do that by inserting this into your squid.conf configuration file:tcp_outgoing_address IPNote, that the IP you put there is the IP assigned by the ISP you want to route the proxy traffic through.
You should also have : ip rule from IP table DSL_ISP_TABLE_NAMEto route packets from that IP by looking up this table:ip r a default via XX.XX.XX.XX table DSL_ISP_TABLE_NAMEwhere you specify the default gateway provided by your second ISP.
Hope this will help you,Andrei Sandu.On 10/3/06, Brent Clark <[EMAIL PROTECTED]> wrote:
Hi allCould someone please me with my current setup.I just got another DSL line and I have my routing  and marking the packets etc so that I can decided the fate as to which ISP I would like to route my
traffic out of etc.I managed to get squid to be used as a trasparent proxy, but im forced to use the default gw of the machine and for the likes of my I cant figure out tosend traffic out the new ISP.
So my question / request for help is, Would anyone please advise me as to how I can choose what ISP I can route my transparent proxy.I was thinking that maybe it is a POSTROUTING marking that I need to do, and the the routing tables will take care of the rest.
Kinds Regards and thank you in advance.Brent Clark___LARTC mailing listLARTC@mailman.ds9a.nl
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Re: [LARTC] Two outbound internet links, using one network interface

[Dashamir Hoxha]

Pio Mendez wrote:


 


>Pio Mendez wrote:
>>PREROUTING chain is not traversed by local traffic, but OUTPUT
>>chain does.
>
>I think that OUTPUT is traversed after routing decision is taken, so
>it is still the same problem.


I'm using OUTPUT chain in production environment to balance squid
box traffic between 2 ISP, so I'm sure that you can reroute output
packets using mangle OUTPUT chain.

After traversing mangle and nat OUTPUT chains there is another
routing process. Please check this diagram:

http://www.imagestream.com/~josh/PacketFlow.png



Pio Mendez is right. I have just tested it and it works.
Now the script becomes something like this:

-8<--
ip link set eth0 up
ip address flush eth0
ip address add $IP1 dev eth0
ip address add $IP2 dev eth0

route add to default via $GATEWAY1

ip route flush table 2
ip route show table main | grep -Ev ^default \
| while read ROUTE ; do ip route add table 2 $ROUTE ; done
ip route add table 2 default via $GATEWAY2

ip rule del fwmark 2 table 2   2>/dev/null
ip rule add fwmark 2 table 2

iptables -t mangle -N MARK-RULES
iptables -t mangle -A PREROUTING -j MARK-RULES
iptables -t mangle -A OUTPUT -j MARK-RULES

PORT_LIST="22 53"
for PORT in $PORT_LIST
do
iptables -t mangle -A MARK-RULES -m tcp -p tcp -dport $PORT -j MARK 
--set-mark 0x2

done

iptables -t nat -A POSTROUTING -o eth0 -m mark --mark 0x2 -j SNAT 
--to-source $IP2

iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source $IP1
8<-
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