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Chapter 13
Configuring the Mobile IP Home Agent
Mobile IP Overview
This chapter describes how to configure the Mobile IP home agent on E Series routers.
Mobile IP Overview on page 315
Mobile IP Platform Considerations on page 319
Mobile IP References on page 319
Before You Configure the Mobile IP Home Agent on page 319
Configuring the Mobile IP Home Agent on page 320
Monitoring the Mobile IP Home Agent on page 325
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.
NOTE: You need to establish only one tunnel between the home agent and the CoA.
Demultiplexing of the traffic is done through IP address inspection.
315
Mobile IP Overview
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