I currently have a system I am doing work on (just took over) and they have two sites, one local running on subnet 192.168.1.x and an remote site running on 192.168.2.x.
The main site (1.x) has a 2003 SBS PC (1.11) and 2 Snapgear routers. One router (1.8) is used as the default gateway and the second router (1.6) is used to establish a VPN connection to the remote site (router to router VPN, remote router is 2.6).
What I would like to do is have the remote site (x.2) be able to see and join the 2003 SBS DC (1.11).
If I set the Gateway for the SBS Box to 192.168.1.6 (VPN router) I can see it on the remote site (via IP not name), but that causes allot of other problems. I have also tried adding 192.168.1.6 as a "secondary" gateway in TCP/IP settings (with a metric of 1) and that does not seem to help.
I have setup similar things befor with static routes/subnet trusts but this was using 1 router at the main site not 2.
Let me know if you need any more info about the setup.