[Openswan Users] Strange Problem with L2TP/IPSec

[Paul Wouters]

On Thu, 1 Sep 2005, Ravi Verma wrote:

> I am having a strange problem. I have an Openswan setup for VPN connection
> for L2TP/IPSec and Openswan-Openswan connection. It is running on Fedora
> Core 4. I am able to connect to the VPN server with my Linux laptop and
> from Windows XP from home without any problem.
>
> But when I my colleague tries to connect to the Openswan server, I observe
> an error in the /var/log/secure file at the Openswan server that my laptop
> has already used that virtual IP address my colleague is connecting from.
> while I or my Linux laptop has never been to that site.
>
> Any idea as to what can cause this and how to get around this issue?

> Sep  1 13:55:11 lb pluto[4366]: "roadwarrior-l2tp"[5] 205.225.241.126 #15:
> Virtual IP XXX.225.241.XXX/32 is already used by '@ravi.telecommand.com'

Are you both connecting from behind the same NAT to the same VPN server? Or
are you connecting from different networks, being NATed to the same IP range,
to the same VPN server?

We are working on trying to fix this issue.

Paul