Hi,

I wrote:
 
> I'm using 1.5.2 wih racoon-20011215a.
> I want to build an encrypted tunnel (tunnel between
> hosts VPN-A and VPN-B) for connections between hosts
> Host-A and Host-B in the following way:
[...]

It was my fault :-)
During a reboot my host VPN-A had lost its ability for ip-forwarding.
Now I have put it in /etc/sysctl.conf, everything is fine.
My tunnel works great (other end is a Checkpoitn FW).

Andreas