> I'd imagine the amount of multicast for IPv6 is more than 10x (just
> guessing) larger unless mitigation is put in place,

I'm perhaps confused, but I don't see why.  ARP is somewhat loosely
specified, so it's difficult to say for sure without checking the
implementations, but I'd expect ND to be just as efficient as ARP.

> If you miss a couple of consecutive RAs in IPv6, you abandon your prefix
> and your default route.

I'm confused again.  PIO lifetimes are on the order of hours, or even
days, while unsolicited RAs are sent every 60s.  Plus there's nothing
preventing you from sending them more often.

-- Juliusz

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