starting vpn&routing drops network

Hello.

I have 2 W2k servers – one a PDC and the second a SDC, both running AD. I’m trying to set up a simple VPN interface for remote administration. I’ve tried just about every sensible combination of options in Routing and Remote Access on both servers, and whenever I start the service on either machine, no matter what I do, the machine drops connectivity to the LAN, however the VPN connection works fine. Again, this happens on both servers, so I know it?s most likely me doing something wrong here and not the servers. I guess I?m having a major brain fart or something. If someone can point me in the right direction I’d appreciate it. Thanks.