10. DHCP procedure is initiated by UE. During this procedure the controller establishes GTP
tunnel and DHCP offer is sent with GGSN to the assigned IP address.
11. On completion of the DHCP procedure the user continues with the data session. The controller
also triggers the accounting message towards the AAA accounting server.
Figure 253: Captive portal authentication workflow
Successful GTP Tunnel Establishment
Figure 254: Successful GTP tunnel establishment on page 402 shows the workflow of successful
GTP tunnel establishment for WISPr authentication and RADIUS CHAP from the controller.
1. The UE associated controller triggers MAC based authentication, which is rejected by the
AAA server since the UE MAC is not registered.
2. A DHCP procedure is triggered and the IP address is allocated from the DHCP server.
3. When the UE tries to browse a DNAT procedure is performed at the data plane since the
user is not yet authenticated.
4. The user is redirected to login page of the external portal.
5. On user entering his login credentials the external portal calls the controller's API (NBI API)
to complete the authentication procedure
6. The controller triggers the RADIUS CHAP authentication towards the AAA server.
7. On successful authentication the user is disassociated. This complete the UE registration
procedure with external AAA server.
8. The UE re-associates to the AP.
9. MAC authentication is triggered by the controller. The AAA server responds with access
accept with IMSI, MSISDN, QoS (optional) and APN (optional).
SmartCell Gateway 200/Virtual SmartZone High-Scale for Release 3.4.1 Administrator Guide
402
Overview of the Captive Portal
Captive Portal Workflows and VSA
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