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Re: route command cannot set up route through point-to-point interface

> In principle, it should not be necessary to have local and remote
> addresses on a point-to-point link at all.

It's necessary if you expect to communicate between the nodes that
share the link, since otherwise they have no way to name one another.

For routing, addresses of some kind are necessary to tell the routing
code where to route packets, though there's no reason in principle it
couldn't be set up so as to make some kind of "the other end of
interface $IFNAME" thing a valid address for routing purposes.  For our
purposes, use of (IP) addresses is compelled by the routing code's
insistence on using IP addresses to name route destinations.

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