[Openswan Users] XL2TPD/Double NAT issue

Gbenga stjames08 at yahoo.co.uk
Thu Oct 11 08:07:03 EDT 2007


I have the same setup working with winxp - client and vpn server behing nat device. I f you want my config files, I can forward them to you. I am using openswan/netkey though.

I don.t have to change the mtu.


----- Original Message ----
From: Gerald Vogt <vogt at spamcop.net>
To: users at openswan.org
Sent: Thursday, 11 October, 2007 9:16:56 AM
Subject: Re: [Openswan Users] XL2TPD/Double NAT issue

Paul Wouters wrote:
>> Could this be an MTU issue? It is kind of weird that xl2tpd gets a
>> read-ready in select() on a socket but the next recv reports it would
>> still block. Or is this a kernel issue?
> It could be. Did you try setting the ethX mtu to  1472?

I think I am doomed. This box gives me a lot of headache. When try to 
change the MTU with

ifconfig eth0 mtu 1472

I always get an error:

localhost kernel: eth0: Ilegal MTU value 1472,  rounding MTU to:

It does not matter what I set it will only accept 1500.

> Did you also ensure the firewal was off, just in case?

On the server the firewall is not even compiled into the kernel. 
Everywhere else it is off.

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