please help me with this...

[Tibbar]

I'm broadcasting from my computer on a university campus. on the computer that broadcasting (SHOUTCAST) the assigned IP address is different. i meant when I got to www.whatismyipaddress. it gave me a different address then what i see under my LOCAL AREA CONNECTION IP ADDRESS. i put the local address (the one the computer assigned) in the browser. it works. but people can't connect to listen. i also tried the IP that i got from www.whatismyipaddress.com that doesn't work at all. what should i do now. their are two different IP on the computer. one only works only on this computer but no client can.. please help me.. thank you