Windows 98 Logon?

I have a Windows 98 desktop that is connected to a hub, connected to a router, connected through a frame link, to my network. The Windows 98 Machine can not find a domain controller. I can ping it, and it can ping me. Everything seems to be working properly with TCP/IP and the configuration is set up properly. I have also checked the ".pwl" file associations and cleared them. I am at a loss and can't get this to work. Can someone help me. Thanks.

Jay