Mobile VPn Client

Hello,

At my work, we have a watchguard firewall. We have configure windows client
for mobile vpn. Now I want confiure my linux box as mobile vpn.

I have a sarge with kernel 2.6.8 (debian), racoon and ipsec-tools.
I am in a small lan (one firewall/ router, one desktop).

I have configure racoon to use preshare key, 2 level login :
Phase I : des/sha1 group 1
Phase II: 3des/md5 group 1

When I run racoon, I have a massage about a compression error and one other
one about a bin with an ipv6 address (It's seem be my eth0 address).

One idea, one experience ?

Thanks
Thierry