Try this. User interface: ADSL/atm0 choose Custom service: insert a name, zomboidserver or whatever Server IP Address: use the ip number the server has in your local network, something like 192.168.xxx.xxx External Port Start: 16261 External Port Stop: 16269 (!!This number depends on how many players you want to support, it's the sum of the first number 16261 + number of players you want to support!!) Protocol: TCP (if there's an option available for both TCP/UDP use that!) Internal Port Start: 16261 Internal Port Stop: 16269 (!!Same as External Port Stop!!) If the protocol option doesn't have a TCP/UDP option you need to use a second row. Use the exact same values but choose UDP as the protocol. Choose save and your done. Hope that helps!