localhostloopback interface and an
eth0(ethernet) is used for your standard copper network cable and is what you will likely see. It is possible to use multiple interfaces individually or for more a advanced setup can be bonded together work as one interface to increase bandwidth and resilience.
ipsetting in the LinuxGSM or game server config files. The same also applies if you wish to change the IP address of server noficiations you can use the displayip.