It's done in the TCP header, not javascript. The wireless access point runs a captive portal server which redirects all traffic to a pre-specified address until the user authenticates.
It's built into hardware such as: Handlink WSG-4000 D-Link DS-3100 Colubris CN3000 Orinioco AP2500 And it's available as software from a variety of places: NoCat Auth Patronsoft's FirstSpot -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of kram2004 Sent: Monday, January 24, 2005 2:20 AM To: [email protected] Subject: [SOCALWUG] wifi hotspot & redirection question... 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? anyone know? thanks! Kram
