[Mip4] 3344bis clarification on identifying the FA's SA

Hi.  I realized during our Deregistration/FHAE discussions that
we assumed that the FA's SA is indexed by the source IP address of the
RRQ on the HA.  But it's not explicitly clear in RFC 3344 (going back to
RFC 2002) that source IP address is the method to identify the FA since
CoA may also be used.

So this leaves ambiguity in implementation and also introduces deployment
issues where the SA is configured based on CoA.

I think we should clearly state some text to avoid ambiguity?  Something like
"The FA or HA is identified by the source IP address of the registration
message.  This IP address and the SPI is used to index the security
association to authenticate the message."

Thoughts?

Kent

--
      |           |                   Kent Leung
     :|:         :|:                  IP Mobility Development
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  c i s c o S y s t e m s             Email: kleung@cisco.com

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