Re: uni-based-mcast and malloc-ipv6-guide

[Thomas Narten]

> How so?  One can renew multicast addresses.  (Conceivably an
> implementation could support the ability to automatically renew
> multicast addresses as long as the unicast address stays valid.)

Suppose I want to get a multicast address so I can advertise a session
(e.g., on a web page). I do this two weeks in advance of the event. I
want the address to last one day only. The key point is that I will
want to use the address staring two weeks from now.

However, because unicast lifetimes are only a week, that's too far
into the future to actually get the address (yet), so the address
can't be obtained yet. This would seem like it might be a problem.  Is
it? (I don't know how this scenario fits with the way multicast is
actually used in IPv4, so this really is a question.)

Thomas
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