well with that config that you posted you'd either have to have that computers ip setup as the dmz, or have the port forwarding setup so that the wan ports forward into the lan ports (set it up so that it forwards to the computer running the servers) its pretty simple if you know what your doing, but some routers might not be able to go along with it cause they were a "cheap class of routers" quite a few routers can, but if you dont know how check your manual or go to
http://192.168.0.1 and try to set it up.