RE: rp-l2tpd iptables and rh9 but no google

["Aldo S. Lagana" <alagana@discmail.com>]

I had a funky issue that was similar and it turned out that I had the wrong
subnet mask on my internet interface.  Coincidentally, my network also
started with 64. (I think) - the same as google; but because my subnet mask
was wrong, I could not see google!


-----Original Message-----
From: netfilter-admin@lists.netfilter.org
[mailto:netfilter-admin@lists.netfilter.org] On Behalf Of Rob Verduijn
Sent: Monday, July 28, 2003 4:19 PM
To: netfilter@lists.netfilter.org

Hi again,

I've set my MTU on eth0 eth1 and ppp0 to 1472
Ive been playing around with tcpdump
I gave the following command
tcpdump -i ppp0 -w dumptcp
When I surf to www.redhat.com everything goes wel and I get all kinda output
in my file
But when I surf to google I get nothing, no output whatsoever.
Did I give in the wrong syntax?

Regards
Rob



-----Original Message-----
From: netfilter-admin@lists.netfilter.org
[mailto:netfilter-admin@lists.netfilter.org]On Behalf Of Eric Leblond
Sent: vrijdag 18 juli 2003 21:49
To: netfilter@lists.netfilter.org
Subject: Re: rp-l2tpd iptables and rh9 but no google


Le ven 18/07/2003 à 21:01, Rob Verduijn a écrit :
> Hi there,
>
> I've got this curious problem with netfilter.

> I did
> echo 1 > /proc/sys/net/ipv4/ip_forward

>
> I can ping google so icmp seems to work but I can't surf the web for
google.
> Neither windows nor linux will work.

You may have look to the MTU, with encapsulation in L2TP you loose some
bytes.
To test try increase your ping size with the -s option.

If it is working with -s 1500 then try to look at tcpmss.

BR,
--
Eric Leblond <eric@regit.org>