Just gave it another try with one game server running with defaults, went to start another ./dsgame --port 54232 192.168.0.102 also without the ip, got the following output.
..throwing an instance of 'zmq::error_t' what(): Invalid argument Aborted (core dumped)
Multiple map servers
Re: Multiple map servers
./dsgame --ip 192.168.0.102 --port 54232
Re: Multiple map servers
Ah thanks, not sure what I was thinking with that syntax, that did work.