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

[Dave Thaler]

Erik Nordmark asks:
> I fail to understand why routing might fail. Could you explain?
> I do understand that there is a different probability of allocating
> duplicate
> uni-based mcast addresses should the unicast prefix be assigned to
another
> entity, but this doesn't lead to routing failing unless you are
assuming
> that routing will do something it doesn't currently do.

Just like providers do source ingress filtering, there might be
something similar that providers would do here.  (Maybe, maybe not.)

-Dave
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