Static Routes With Linux & Shorewall (site To Site VPN Virtual Private Network)

Attached is a (badly) drawn diagram of two sites, connected by a vpn.

The site to the left, is network 10.0.0.0/24 which runs a linux server as the router for the network.

The site to the right, is network 10.1.0.0/24 which runs a windows 2003 server as the router for the network.

Now, my problem is, the clients behind the windows 2003 server can ping any machine on the first network because i setup a static route to route all traffic to 10.0.0.0/24 over the vpn interface.

now, my problem is, only the linux server can ping any machine on the windows 2003 network, any client behind the linux server cant seem to route over the interface.

I have the following route on the linux server: .....