Try this site, www.happyhacker.org
scroll down untill you see the link for mostly harmless hacking...
You will find the answer to your question.
(NOTE THAT IS NOT A REFERENCE TO USE IT TO FLOOD A isp SO AS TO CRASH THE SYSTEM OR TO BYPASS THE FIREWALL)
oR ANOTHER WAY TO BYPASS THE FIRE WALL IS TO TYPE.......
netsta -a
netstat -r
netstat -an
(JUST A FEW IDEAS, NOT TO SURE IF THEY ARE THE RIGHT COMMANDS, IM MORE AT HOME USING TELNET SO I JUST TRYING TO HELP ANYHOW......