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3G DHCP Discover Call Flow Configuration
13 The iWAG sends a query to the DNS server to resolve a given Access Point Name (APN) to a GGSN IP
address.
14 The DNS server sends the DNS-resolved GGSN address back to the iWAG.
15 After receiving the DNS-resolved GGSN address, the iWAG sends the Create PDP Context Request, in
which the PDP context address is set to 0, in order to request the GGSN for an IP address assignment.
16 The GGSN sends a RADIUS Access Request to the AAA server.
17 Based on the cached information obtained from the EAP-SIM authentication, the AAA server replies with
a RADIUS Access Accept message to the GGSN.
18 The GGSN sends the Create PDP Context Response that carries the assigned IP address c.c.c.c for the
subscriber, to the iWAG.
19 The iWAG sends a DHCP Offer message to the mobile device.
20 The mobile device sends a DHCP Request message to the iWAG, and the iWAG acknowledges this request
by sending a DHCP ACK message to the mobile device.
21 The WiFi subscriber traffic now has a data path through which it can flow.
3G DHCP Discover Call Flow Configuration
The following example shows a 3G DHCP Discover call flow configuration:
aaa new-model //authentication, authorization, and accounting configurations
!
!
aaa group server radius AAA_SERVER1
server-private 99.0.7.10 auth-port 1812 acct-port 1813 key cisco
!
aaa authentication login default none
aaa authentication login WEB_LOGON group AAA_SERVER1
aaa authorization network ISG_PROXY_LIST group AAA_SERVER1
aaa authorization subscriber-service default local group AAA_SERVER1
aaa accounting network ISG_PROXY_LIST start-stop group AAA_SERVER1
aaa accounting network ACCT_SERVER
action-type start-stop
group AAA_SERVER1
!
!
!
!
!
aaa server radius dynamic-author
client 99.0.7.10 server-key cisco
auth-type any
ignore server-key
!
aaa session-id common
aaa policy interface-config allow-subinterface
clock timezone EDT -4 0
!
!
!
!
!
!
!
!
!
no ip domain lookup
ip domain name cisco.com
Intelligent Wireless Access Gateway Configuration Guide
104
Call Flows for 3G and 4G Mobile IP Users
OL-30226-03
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