Proxy CCoA Tunneling for Mobile IP

Document Type Expired Internet-Draft (individual)
Author Alan O'Neill 
Last updated 2002-05-09
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Expired & archived
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


In MIPv4, when a Mobile Node (MN) registers with the 'D' bit, in the MIP Registration to a Home Agent (HA), then the MN wishes to use a Co-located Care-of address (CCoA) with a specific Home Address (HoA). Packets sent to the MN Home Address (HoA) will then be encapsulated in the CCoA by the HA and forwarded directly to the MN. Alternatively, a MN can obtain from the local Foreign Agent(FA) a shared FA CoA for inclusion in its MIP Registration to the FA/HA. In this case, the HA encapsulates to the FA CoA, and the Foreign Agent then decapsulates and delivers the HoA addressed packet unencapsulated to the MN. This draft adds to MIPv4 the ability for the MN to acquire a MN specific FA CoA that provides the MN with a topologically correct local address and whose tunnel encaps/decaps is provided by the FA. This address is called a proxy CCoA (PCCoA) and the associated processing in the MN and FA is called Proxy CCoA tunneling. This capability is applicable to any access technology but is especially useful for wireless systems where the access bandwidth is expensive and when point-to-point link-layer connectivity exists between the MN and the FA. This draft also describes reverse tunneling and smooth hand-off extensions based on the PCCoA that enables inter-FA forwarding even for CCoAs.


Alan O'Neill (

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