Re: Problem accessing some websites

[Guillaume CHARDIN <guillaume.chardin@gmail.com>]

> Great thats about all the things I would have checked as well.
>
> you can test from linux itself with ping -M do -s <packet size> -c 10
> <dest ip>
>
> I would try using the ping above to find the max mtu size to say
> your isp dns or proxy.
>
> then try it to the sites you can't always get to
>
>

I do the same test on the gateway and on windows clients below the results :

Linux debian 5
ping -M do -s 1465 -c 10 86.64.145.147
PING 86.64.145.147 (86.64.145.147) 1465(1493) bytes of data.
>From 86.77.213.79 icmp_seq=1 Frag needed and DF set (mtu = 1492)

ping -M do -s 1464 -c 10 86.64.145.147
PING 86.64.145.147 (86.64.145.147) 1464(1492) bytes of data.
1472 bytes from 86.64.145.147: icmp_seq=1 ttl=56 time=56.0 ms
   --> So mtu is 1464 (+8 ?)

on windows :
ping -l 1464 -f 86.64.145.147
Envoi d'une requête 'ping' sur 86.64.145.147 avec 1464 octets de données :
Réponse de 86.64.145.147 : octets=1464 temps=54 ms TTL=55

ping -l 1465 -f 86.64.145.147
Envoi d'une requête 'ping' sur 86.64.145.147 avec 1465 octets de données :
Le paquet doit être fragmenté mais paramétré DF.
   --> Same MTU 1464

Same thing on the websites i cannot access

Haha,  this issue is starting to make me crazy !
-- 
Guillaume