Charlie,
> 8.1. Requirements for All IPv6 Hosts and Routers
>
> Since any IPv6 node may at any time be a correspondent node of a
> mobile node, either sending a packet to a mobile node or receiving
a
> packet from a mobile node, the following requirements apply to ALL
> IPv6 nodes (whether host or router, whether mobile or stationary):
>
> - Every IPv6 node MUST be able to process a Home Address option
> received in any IPv6 packet.
>
> - Every IPv6 node SHOULD be able to participate in a return
> routability procedure, process Binding Update messages, and to
> return a Binding Acknowledgement option if the Acknowledge (A)
> bit is set in the received Binding Update.
>
> - Every IPv6 node SHOULD be able to maintain a Binding Cache of
the
> bindings received in accepted Binding Updates.
>
>
========================================================================
>
> Furthermore, even if those SHOULDs remain SHOULDs (a mistake, in
> my opinion), a _cellular_ host is a case where it MUST be a MUST.
> Such nodes are even more likely than generic IPv6 nodes to be
> maintaining communications with mobile nodes -- for instance with
> VoIP.
>
I agree with the level of "required to implement" as specified in the
text above.
jak
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