public access zone:
-access from zone to network controlled by public access controller
-public access controller pac tries to be independent of clients, solutions available at least from Cisco and Nokia
-by default pac doesn’t let any user traffic through (maybe dns etc.)
-capture user web page retrieval request, returns the authentication page or http redirect as response
-user fills authentication information on web form
-public access controller verifies the authentication information from user database
-if authentication correct, the pac opens a ”hole” to its firewall rules to the IP address user is using
-the user now has free or restricted (by firewall rules in pac) connection to Internet

Other authentication solutions:
-Nokia’s Operator WLAN concept (possibilitiy to combine billing for GSM and WLAN)
   Feb. 9th "More WLAN business cases", Mikko Järvinen
   from Wireless LANs course: http://www.cs.tut.fi/kurssit/83180/
   ”Public Access Zone and Nokia Operator WLAN”, Ari Viljakainen
   from Wireless LANs course: http://www.cs.tut.fi/kurssit/83180/
-Cisco’s changing WEP keys solution
-requires Cisco client and Cisco access points
-