Modifications to Regional Tunneling
draft-oneill-mip-regtun-mods-00

Abstract

Regional Registration modifies the normal MIP Registration signalling back to the HA so that the signalling can traverse an intermediate Gateway Foreign Agent (GFA). The registered binding is between the Home Address (HoA) and the GFA Care-of Address (GFA-CoA) in the Home Agent (HA), and between the GFA-CoA and the Foreign Agent (FA-CoA) in the GFA. Two extensions are defined to support this new Registration processing these being the Hierarchical Foreign Agent extension (HFAext) and the GFA IP address extension (GFAIPext). The former is used to carry the FA CoA to the GFA and the latter is used by the FA to allocate a GFA to the MN, and by the FA, GFA, HA to securely return the GFA IP address to the MN. The present processing rules for the HA registration enable the FA to advertise the GFA to the MN in a Foreign Agent Advertisement (FAA) and for the MN to include that GFA address into the CoA field of the MIP me Registration. This however assumes a number of things about the GFA address in the FAA and the addressing realms between the FA-GFA and GFA- HA.. Specifically, the GFA CoA and the GFA IP address must potentially be from two different addressing plans and hence cannot be in the same FAA. This draft describes the issues and suggests a solution that requires slight modifications to the required extensions, that generalises the Home Registration signalling for arbitrary intermediate MIP nodes, and only slightly modifies the processing rules for the MIP Home Registration. This draft also describes a way to support dynamic HA allocation along-side Regional Registrations.

Authors

Alan W. O'Neill

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