Cable Internet Access and Network

I’m using Win98SE on computer network. A couple of computers cannot access the internet and the others can. TCP/IP settings appear to be the same (also have NetBEUI installed). A linksys router is being used which is connected to a Motorola Modem. Ihave allowed IP addresses to be set automatically (not assigned). I get a DNS error cannot connect – as mentioned above, though all settings appear to be the same.

Computers can all see each other and access drives.

Thanks for the help!