Cisco 2811 issue

Dear All,

I got a cisco 2811, router with 2 FE ports. One of them is connected to IPCONNECT line and other one to the internal LAN.

I am able to telnet to my remote site from the router , but I cant do it from the internal LAN. I had given the routes in the router but still the same problem.

What might be the problem? Could someone help me in this as it is very URGENT. Thanks in advance