I am having a hard time finding out about public wireless access points which require you to pay to use them, you know the kind like those T-mobile ones etc.. I know this will probably sound silly but I really can't get google to give me anything useful about how they work. I just can't come up with a decent search query, try it yourself if you don't believe me My question is just: how do they authenticate clients, do they run dns proxys to block people who haven't paid? It surely can't be as simple as 'this mac address is allowed all others aren't' because you could just disassociate the client and spoof their mac, do they perhaps use encryption? I am not asking to be spoon-fed here, just a link or a paper, or maybe somebody here knows more about the software running on these APs, any discussion would be really appreciated.
NoCat is an open source walled garden. http://nocat.net This is a good overview of how it functions: http://www.oreillynet.com/pub/a/wire...nocatauth.html
Stop the TSA now! Boycott the airlines.
* ssh tunnel
* openvpn tunnel
* dns tunnel :P ( slow as balls but a fun project ) also ICMP can tunnel too
Thanks for all the replies guys, that's really helpful, the captive portal stuff appears to be what I'm looking for. I get the impression these hotspots are fairly difficult to bypass and I wanted to know why, cheers.