RG            UP              CP         AAA      Web Server
     |    DHCP     |                |          |           |
     |  Discovery  |                |          |           |
    1|------------>|                |          |           |
     |             | DHCP Discovery |          |           |
     |            2|-----via Si---->|   AAA    |           |
     |             |   DHCP Offer   |<-------->|           |
     |            3|<----via Si-----|          |           |
     |  DHCP Offer |                |          |           |
    4|<------------|                |          |           |
     | DHCP Request|                |          |           |
    5|------------>|                |          |           |
     |             |  DHCP Request  |          |           |
     |            6|-----via Si---->|          |           |
     |             |                |          |           |
     |             | Create Session |          |           |
     |             |    Request     |          |           |
     |            7|<----via Ci-----|          |           |
     |             | Create Session |          |           |
     |             |    Response    |          |           |
     |            8|----via Ci----->|          |           |
     |             |                |          |           |
     |             |  DHCP ACK      |          |           |
     |            9|<----via Si-----|          |           |
     |  DHCP ACK   |                |          |           |
   10|<------------|                |          |           |
     |             |                |          |           |
     | Subscriber  |                |          |           |
     | HTTP Traffic|                |          |           |
   11|------------>|-->             |          |           |
     |             |  | Web URL     |          |           |
     |  Traffic    |  | Redirect    |          |           |
     | Redirection |  |             |          |           |
   12|<------------|<-+             |          |           |
     |                                                     |
   13|-----------------Redirect to Web Server------------->|
     |                                                     |
   14|<----------------Push HTTP Log-in Page---------------|
     |                                                     |
   15|-----------------User Authentication---------------->|
     |                                                     |
     |             |                |  Portal Interchange  |
     |             |              16|<-------------------->|
     |             |                |                      |
     |             |                |   AAA    |           |
     |             |                |  Req/Rep |           |
     |             |              17|<-------->|           |
     |             |                |          |           |
     |             | Update Session |          |           |
     |             |    Request     |          |           |
     |           18|<----via Ci-----|          |           |
     |             | Update Session |          |           |
     |             |    Response    |          |           |
     |           19|-----via Ci---->|          |           |
     |             |                |          |           |