[ih] Origin of the loopback interface

[John Day]

The problem was solved 50 years ago. It is just that the Internet doesn’t like the solution.


> 
> multihoming is one of the great unsolved problems in internetworking. we 
> do it properly on routers -- there, the loopback has the router's "real" 
> ip address -- but only because the router is on-path and can inject its 
> loopback address (which usually is not subnetted) into the topology.
> 
> (*) name, file, and time servers have to know what interface they were 
> contacted on, and answer from that interface, so they have to 
> periodically rescan the interface list -- but nothing else does.
> 
> -- 
> P Vixie
> 
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