Location update messages for a mobile node can be made interceptible by
routers which form tunnels for communication with the mobile node. A correspondent
agent intercepts a Binding Update with a Router Alert and binds the address of
the mobile node with a care of address for the mobile node provided in the Binding
Update. The correspondent agent will thereafter intercept messages from its correspondent
host destined for the mobile node and redirect them to the care of address thereby
bypassing the home agent of the mobile node. A border router intercepts a Registration
Request with Router Alert and binds the address of the mobile node with a care
of address for the mobile node. If a binding existed previously, then the border
router terminates the Request. Otherwise, the Request is forwarded to the home
agent of the mobile node after substituting its own address for the care of address.
