124Chapter 6: Metro Mobility: Client-Based Mobile IP
A Mobile Nodes explicitly requests reverse-tunneling service by setting the T bit in its RRQ.
(At the risk of stating the obvious, this is different from the T bit in the agent advertisement.
Refer to Chapter 2 for the various option bits in the agent advertisement and RRQ messages.)
This requests the FA to reverse-tunnel all the Mobile Nodes’s packets to the Home Agent, and
requests the Home Agent to accept a reverse tunnel from the CoA. The default method of
delivery for the reverse tunnel is the direct delivery style, and thus, the Mobile Nodes must take
care to use this FA as its default ...
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