Re: IPv6 path MTU discovery not working (large number of retransmited TCP data packets)

> The number 1 rule for IPv6 routing is to *always* use a link local
> address for the next hop, for everything.

Why?  I've been using globally-routed addresses for everything since
2002 and have never had any trouble I can attribute to the practice.
What am I at risk of?

> Never use global (or even ULA) addresses in routes (as destinations,
> obviously they're OK as the subject of the route) IPv6 just isn't
> designed to work properly if you do.

It isn't?  What goes wrong?  Or, more precisely, what parts of the
design have that assumption built in?

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