User's Manual

Detailed Signaling Description and API
Installation and User Guide: Airgo Access Point 267
Figure 189: User authentication using the External Landing Page Server
The HTTP filter in the AP allows the station to obtain an IP address, but redirects any HTTP traffic
to the web server. The URL used in the redirection provides the server with the MAC address of the
station, the SSID used for the association, the IP address of the AP, and the original requested URL.
This data is used by the web server to create a connect request to the AP after successful
authentication.
Redirected URL generated by an AP:
http://1.2.3.4/cgi/
l?gpm=192.168.254.249&origpage=www.google.com&ssid=myHotspot&stamac=00:af:50:00:00:
00
The URL prefix (http://1.2.3.4/cgi-bin/l) was the URL entered in the AP configuration.
The field names and description in the redirected URL are described in Table 18.
Table 18: Fields in the STA-ELPS-to-AP Connection Request
Field Description
gpm The IP address of the AP
origpage The URL originally submitted by the user before the redirection
ssid The SSID used by the station to associate to the AP
stamac The MAC address of the station.
(ELPS)
(Captive Portal)