NT Server configurted as router

I have installed an NT Server as a router between 2 domains. I installed a WINS server on each domain and they are replicating fine. The was originally part of the one domain and we added an NIC to connect to the other.

My problem now is that I can see the entire network from PC’s on the domain where the router was originally located, but can only see the router from the other domain – no other machines?

Thanks for the help.