>> But what about more hybrid architectures where some routers are
>> hosts for other ones...?
> They make life messy and were specifically forbidden in IPv6.

...huh?

It sure doesn't seem to be *effectively* forbidden.  My house gateway,
for example, has two v6 addresses, one on either side, and it works
just fine when treated as a host at either of them.

Or am I misunderstanding, and this applies only when at least one of
the addresses is autoconfigured?  (I actually can't see how that would
fail either, provided something gets routes set up right.)

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