Hello...
just wondering if anyone knows how some of these commercial hotspots (such as tmobile in starbucks or in the 4star hotels) are able to automatically redirect the user's browerser to a specific ip webhost page to login to the hotspot network for internet usage.
i know they use some javascript to redirect the user... but how do they even redirect any/all traffic from the new user who hasn't logged in to the hotspot's login page?
Capture all TCP traffic to port 80. Intercept locally (most of the "free" operating systems have facilities to do this) in a web server which sends a "302 Page Moved" with the new URL back to the client.
