Re: Problem accessing some websites

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

2009/11/25 Alex Samad <alex@samad.com.au>:
> On Wed, Nov 25, 2009 at 08:03:52PM +0100, Guillaume CHARDIN wrote:
>> Hi,
> [snip]
> so when you browse from the linux computer running pppoe you have
> problems ? or only when you have a computer behind it.

I don't have any graphical ui on the linux box but a `wget
website.domain` is endless.

To fix mtu problem, i edit the /etc/ppp/peer/dsl-provider and modify the line :
       mtu 1492
to
       mtu 1450 (i tried many value between 1450-1400)
the disconnect/reconnect.
I tried to set it to another value with the ifconfig command too.

And I found on an internal windows station a max mtu size of 1463
(with ping -l 1463 -f)

For information, the MTU discovery is set on iptable on the debian gateway :
#iptables -t mangle -L
[...]
Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
TCPMSS     tcp  --  anywhere             anywhere            tcp
flags:SYN,RST/SYN tcpmss match 1400:1536 TCPMSS clamp to PMTU

Thanks for your help
-- 
Guillaume