Making the server route all non-local IP-requests to a ISDN-routers
I've got a Red Hat 5.2 server running the standard kernel. I also have a DNS on it. I want it to route all IP-requestst that are not for our network segment to go to a ISDN-router (a 3COM OfficeConnect 511) which would call our ISP and make an internet connection. I've got also a default route to a gateway (the router) configured.
I've tried anything I could figure out and read about all the HOWTO's on the networking (I think). I'm desperate.