Once upon a time, Sam Varshavchik <mr...@courier-mta.com> said:
> I defy anyone to identify a tangible benefit that comes from
> removing a static IP address from a port when it loses carrier, and
> installing one only once a carrier is present.

It is useful for systems with multiple interfaces, for example a desktop
with wired and wifi, and different preference default routes out both
(so if the wired goes down, traffic can still go out over the wifi).
Anything acting like a router also needs this behavior, typically in
conjuction with dynamic routing protocols.

-- 
Chris Adams <li...@cmadams.net>
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