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There are DNS tunneling apps which will (usually) get past those captive portals that block ICMP. It's just slower.

Back in college I wrote this address on the board and told fellow students that this was a good site to learn some C basics and learn network programming. Most people just laughed at the name, but I like to think Beej helped some people who decided to check it out.

I wouldn't know. I just went through the work of reading their blog post and saw that they addressed the wifi security problem.