server ip* is what players would use to join your server. they would type in, for example, 72.130.204.108:25565 into the multiplayer direct connect and then be able to join your server.
Sure it's: #Minecraft server properties #Thu Mar 07 04:31:07 PST 2013 generator-settings= allow-nether=true level-name=world enable-query=true allow-flight=false server-port=25565 query.port=25565 level-type=DEFAULT enable-rcon=false level-seed= server-ip= max-build-height=256 spawn-npcs=true white-list=false debug=false spawn-animals=true texture-pack= hardcore=false snooper-enabled=true online-mode=false server-id=unnamed pvp=true difficulty=1 enable-command-block=true server-name=Maihym's Server hold-message= gamemode=0 max-players=25 spawn-monsters=true view-distance=15 generate-structures=true spawn-protection=5 motd=MaihymCraft Also i'm using Remote Toolkit
aha, theres da problem! joking aside, I did some researching on google, and could not find any definite description for what its purpose is. After looking through some forums though, i found a post in a thread where someone was having issues with his server, and he was told that he had some configuration options from old or dev versions. So to put it shortly, the option most likely does nothing and is from an old or dev server config
