Routing problem with openvpn and openswan

[Andreas]

Hi!
I have a dapper-box which acts as a VPN-gateway to another office via 
OpenSwan, works like a charm. This dapper-box is also an OpenVPN-gateway 
to the office lan for our roadwarriors out in the world. It also works 
perfect.

Now, our roadwarriors need to access a server on the remote office 
connected via the OpenSwan link. And that's my problem. I can't figure 
out how to route and nat the traffic from the openVPN link over to the 
OpenSwan link so they can reach the remote office.

The office lan has ip range 10.30.0.0/24. Traffic from the roadwarriors 
comes in on tun0 and comes the 10.8.0.0/24 range. The remote office net 
has 10.31.116.0/24.

eth0 = 10.30.0.253 (local office lan)
eth1 = 1.2.3.4 (external address)
tun0 = 10.8.0.1 (OpenVPN)
remote office lan = 10.31.116.0/24

Openswan has leftsubnet=10.30.0.0/24 option set, so I'm guessing that I 
have to do some magic tricks to transform the OpenVPN traffic or something.

Any clues?

/Andreas