For years I was using OpenWRT, and had no problems getting Cisco VPN client to work (on my PC, behind NAT of course).

I switched to Tomato/Victek, and now I can no longer get it to work. The client connects, but the tunnel doesn't pass data.

Does anyone else use this? Any idea what to change?

Note that I am NOT talking about running VPN in the router itself, but rather on my PC. So I don't think installing the VPN mods for Tomato is the answer (at least from what I've read).