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CHAPTER 13
Configuring the Mobile IP Home Agent
Mobile IP Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes how to configure the Mobile IP home agent on E Series routers.
Mobile IP Overview on page 303
Mobile IP Platform Considerations on page 307
Mobile IP References on page 307
Before You Configure the Mobile IP Home Agent on page 307
Configuring the Mobile IP Home Agent on page 308
Monitoring the Mobile IP Home Agent on page 313
Mobile IP is a tunneling-based solution that enhances the utility of E Series routers at
the edge of the network between fixed wire and wireless network domains. This
tunneling-based solution enables a router on a user's home subnet to intercept and
forward IP packets to users who roam beyond traditional network boundaries. Mobile IP
is useful in environments where mobility is desired and the traditional land line dial-in
model does not provide an adequate solution, and in environments where a wireless
technology is used.
NOTE: Currently, JunosE Software does not support configuration of the Mobile IP
foreign agent.
Traditionally, IP addresses are associated with a fixed network location. To achieve
mobility, the mobile node assumes a secondary IP address that matches the new network
and redirects the traffic bound to the primary or home address to the mobile node's new
network. In the Mobile IP architecture, the two agents that accomplish this task are the
home agent and the foreign agent.
When a mobile node roams into a new network, it negotiates with the foreign agent to
get a secondary IP address, which is referred to as the care-of address (CoA). The mobile
node registers this CoA with the home agent. The home agent then establishes a tunnel
to the CoA if the tunnel is not established earlier.
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