Mobile Ip Agent Discovery; Mobile Ip Registration; Home Address Assignment; Authentication - Juniper IP SERVICES - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x IP Services Configuration Guide
Packets sent to the home address of the mobile node are redirected by the home
agent through the tunnel to the CoA at the foreign agent. The foreign agent routes
the packets to the mobile node's home address. If the mobile node's home address
is a private address or if the foreign agent implements ingress filtering, a reverse
tunnel from the CoA to the home agent is required.
You can use the Mobile IP home agent feature to configure the home agent within
a virtual router. The home agent handles the following tasks:

Mobile IP Agent Discovery

Mobile nodes use the agent discovery process to identify whether they are on their
home network or have roamed into a different network (referred to as a foreign
network). Both the foreign agent and the home agent periodically multicast their
agent advertisements. You can also request an agent advertisement from the mobile
node through Internet Control Message Protocol (ICMP) router solicitations.

Mobile IP Registration

The home agent receives the registration requests on UDP port 434. The registration
request contains the IP router ID as the home agent IP address. The home agent can
support static home address allocation and dynamic home address allocation.

Home Address Assignment

The mobile node's home address can either be preconfigured, or dynamically allocated
by the Mobile IP home agent. If a nonzero home address is preconfigured, the home
agent processes the registration request using the home address. If the home address
is dynamically allocated, the mobile node submits a nonzero home address and
requests the home agent to assign an IP address. The mobile node then uses the
address provided by the home agent for subsequent registration requests, until the
mobile node is rebooted or the registration expires.
Home address allocation is done by one of the existing AAA back-end address
mechanisms, such as:

Authentication

The home agent authenticates the requests based on RFC 3344 IP Mobility Support
for IPv4 (August 2002). The mobile home authentication is verified and the
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Mobile IP Overview
Agent discovery
Registration
Routing and forwarding
By RADIUS
From an address pool returned by RADIUS
From a local pool
By the DHCP server