Subject: [mobile-ip] Low Latency MIPv4 Handoffs: PreReg Failure Recovery

From: Jonathan Wood <[email-masked]>
Date: Fri, 2 Nov 2001 13:23:36 -0800 (PST)

How do MNs and FAs recover from a failed PreReg handover? For example,
if the MN's pre-registration request is lost of delayed, what needs
to happen to ensure continued packet delivery?

PreReg requires a lot of messages to traverse many links, opening
up lots of opportunities for failure:
    Solicitation from MN -> oFA
    Solicitation from MN -> oFA -> nFA
    Advert from oFA / nFA --> MN
    Reg Req from MN -> oFA -> nFA -> HA
    Req reply from HA -> nFA -> oFA -> MN (and nFA -> on-link)
It would be useful to consider what would happen if any one of the
messages is lost or delayed.

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