When an HNCP router is restarted, the prefixes it allocated to a link are
"adopted" by neighbouring routers; if the router then restarts, it will
agree to the prefixes advertised by its neighbours, which avoids
renumbering.
Unfortunately, this only applies to link with multiple HNCP routers: on
a stub link, a random prefix will be chosen every time we are restarted,
since there are no neighbours that can maintain the state for us. I can
see the following solutions:
1. store the chosen prefix in stable storage (but stable storage sucks);
2. make an initial choice that is a hash of the interfaces MAC address
(I believe that this is what hnetd does);
3. snoop ND/ARP traffic and intuit a suitable prefix.
Any better ideas?
-- Juliusz
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