No he means there is 1 NIC and on that NIC there are multiple IP's present. The server is located in a datacenter, NOT at home, so multiple IP's is very normal on a dedicated server.
For example the IP's on 1 NIC of the server are:
123.456.789.1
123.456.789.2
123.456.789.3
123.456.789.4
123.456.789.5
How do you get the game to run and listen only on IP 123.456.789.3
Now the game runs on an IP of it own choosing, this results that only 1 of the 2 servers which are installed are visible in the listing but they are both running on the server. (you can connect to both if you connect directly to the IP)
Of course al IP's work, only the config of the game does not seem to get a long with it.