Port info needed to sort out firewall issues

A firewall has been set up in my school. I now find that I cannot connect via iChat, Apple software update, Limewire. Does anyone know what ports need to be opened to let me out?????
There is also a wireless network but on my laptop the airport router defaults to 192.168.0.1 even though its using DCHP. It should be I am told 192.168.0.2
Any help would be great
Thanks
Dave

I don't know offhand what ports those tools use, but maybe I can help you find out. Open a Terminal window, type the following line EXCEPT the carriage return;netstat -n -p tcp | grep SYN_SENTStart one of the tools in question, wait a moment, then hit the carriage return in the Terminal window. I tested this using 'telnet 78.32.198.5' as a "tool", and gottcp4 0 0 10.20.31.105.64498 78.32.198.5.23 SYN_SENTThe fourth column (10.20.31.105.64498) is the local IP/port used by my "tool"; the fifth column is the remote address and port. As you can see, the remote port used for telnet is 23; you should be able to find the remote ports used by iChat, Software Update, and Limewire similarly.

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