Workstations interoperating w/NT & Linux

Linux is my DNS, NT is my PDC, Proxy. I recently have installed NIC in Linux for local IP, NT has 1 NIC for local & valid. Linux (valid IP) & NT (valid IP) share common gateway. THEY CAN PING EACH OTHER.

Problem. workstations can ping & log to NT but not w/ Linux using local IP. Linux also cannot ping local IPs, request timeout error. All WS uses Linux as it’s DNS & gateway.

Requirement. Provide troubleshooting procedures or analysis, most importantly, solution.