External can connect - Internal cannot connect?

[m0oni9]

I'm not sure if setting a host as DMZ properly directs traffic to it from the internal network -- if it does, ignore the rest of the post. You may want to try using port forwarding. I'm not sure if this will solve the problem or not, but I believe that I have seen Linksys routers direct traffic from the internal network correctly with it. Also, afaik, all redirected traffic, incoming from external or internal, will be seen as coming from the router (192.168.1.1).