>it is. if a CN does not support HAO, it will send an ICMP error message
>pointing to the offending octet. when the MN receives this message, it
>starts reverse-tunneling through the Home Agent. where is the problem?
>if this is not clearly specified in the MIPv6 draft, it can be. the
>binding error functionality can also be substituted by an ICMP error.
>Binding Error was specified so that it is easier for the MN to figure
>out whats going on.
then I see no reason for the MUST.
itojun
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