[gull] Problème routage

[Erik Rossen]

On Sun, Jul 24, 2005 at 11:01:35AM +0200, Martial Guex wrote:
> On Saturday 23 July 2005 20.16, Martial Guex wrote:
> 
> Après quelques investigation avec des pings non fragmenter la limite soit de 
> 542 (514+28) octets que ce soit depuis les machines MS, Linux ou le firewall, 
> je ne sais pas d'où sort cette valeur alors je fais de la spéléo.
> Si quelqu'un à une idée, je prend.

No idea, but I just want to confirm that the same problem exists from my
computer as the following test demonstrates:

root at banana:~# ping -c 1 -s 548 -M do www.cff.ch
PING www.sbb.ch (193.192.251.35) 548(576) bytes of data.
556 bytes from cargo4prod.sbbcargo.ch (193.192.251.35): icmp_seq=1
ttl=234 time=53.8 ms

--- www.sbb.ch ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 53.800/53.800/53.800/0.000 ms
root at banana:~# ping -c 1 -s 549 -M do www.cff.ch
PING www.sbb.ch (193.192.251.35) 549(577) bytes of data.

--- www.sbb.ch ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

My guess is that someone at the CFF has misconfigured one of their
routers.  In the meantime, try my suggestion, at least on your web proxy
server:

net/ipv4/ip_no_pmtu_disc=1

-- 
Erik Rossen           A. It breaks the flow of conversation.
rossen at linux-gull.ch  Q. Why is top-quoting annoying? 
http://www.linux-gull.ch               OpenPGP key: 2935D0B9