Configuring Mobile IP
Mobile IP Configuration Task List
IPC-167
Cisco IOS IP Configuration Guide
Because Mobile IP requires support on the host device, each mobile node must be appropriately
configured for the desired Mobile IP service with client software. Please refer to the manual entries in
your mobile aware IP stack vendor documentation for details.
Mobile IP Configuration Task List
To enable Mobile IP services on your network, you need to determine not only which home agents will
facilitate the tunneling for selected IP address, but also where these devices or hosts will be allowed to
roam. The areas, or subnets, into which the hosts will be allowed to roam will determine where foreign
agent services need to be set up.
To configure Mobile IP, perform the tasks described in the following sections as related to the functions
you intend to support. The tasks in the first two sections are required; the tasks in the remaining sections
are optional.
•Enabling Home Agent Services (Required)
•Enabling Foreign Agent Services (Required)
•Configuring AAA in the Mobile IP Environment (Optional)
•Configuring RADIUS in the Mobile IP Environment (Optional)
•Configuring TACACS+ in the Mobile IP Environment (Optional)
•Verifying Setup (Optional)
•Monitoring and Maintaining Mobile IP (Optional)
•Shutting Down Mobile IP (Optional)

Enabling Home Agent Services

Home agent functionality is useful within an enterprise network to allow users to retain an IP address
while they move their laptop PCs from their desktops into conference rooms or labs or common areas.
It is especially beneficial in environments where wireless LANs are used because the tunneling of
datagrams hides the movement of the host and thus allows seamless transition between base stations. To
support the mobility of users beyond the bounds of the enterprise network, home agent functionality can
be enabled for virtual subnets on the DMZ or periphery of the network to communicate with external
foreign agents.
To enable home agent service for users having homed or virtually homed IP addresses on the router, use
the following commands in global configuration mode:
Command Purpose
Step1 Router(config)# router mobile Enables Mobile IP on the router.
Step2 Router(config-router)# exit Returns to global configuration mode.
Step3 Router(config)# ip mobile home-agent Enables home agent service.
Step4 Router(config)# ip mobile virtual-network net mask
[address address]
Adds virtual network to routing table. If not using a
virtual network, go to step6.
Step5 Router(config)# router protocol Configures a routing protocol.
Step6 Router(config)# redistribute mobile Enables redistribution of a virtual network into
routing protocols.