All you should need to do is set up the IP addy, And perhaps the WINS,DNS and Route (in TCP/IP). Go to properties of network neighborhood. Under Identification make sure the Workgroup name is the smae as the workgroup on the domain. Under Configuration, go to properties of Clent for Microsoft Networks and under logon to NT domain, check the box and Input the domain name. Save all this and reboot. Now you should be able to logon to the damain and see all the available resources. But most of all under TCP/IP you need to make sure that the Gateway is set up with the IP address of the router.
Hope this helps.