DUN DHCP Sets IP to Same as Gateway

Windows 95, DUN ver 1.4 for 95. Computer dials and connects to ISP but sets the ipaddress to the same as the Gateway address. This prevents connecting to the internet or pinging any name/IP address except the gateway, which essentially is the same as pinging local host. Tried uninstalling/reinstalling DUN, IE 5.5, tcpip . etc. Not having any luck. I think a Reg hack might fix this but I havn’t been able to find one yet