I have two internal private networks that I'm trying to connect using a 1721 router. I am able to telnet from network 1 to the router, and ping from router the gw on network 2, but I can't ping anything back on network 1. Also, I can't ping network 2 from network 1. Can someone give me the correct route or other commands I need to get started. I'm not worried about security, this is just for testing. Once I make the connections, I can start playing around with more advanced commands. Network 1 is 10.10.x.x/16 and Network 2 is 10.20.20.x/24. Thanks.
I have this problem too.