[nsp] using /31s

[Tomas Daniska]

> The problem w/
> 
> 'ip unnumbered'
> 
> Is that you now depend on another interface being up.  
> Granted the other 
> interface is usually a ethernet interface which is pretty 
> reliable, you 
> open yourself up to one more point of failure.
> 

one usually wants a _stable_, link-independent ip on a box - so it's not
needed to try all possible ip's just to reach the box in case some
link(s) fail(s)

so one usually has a loopback interface which doesn't use to go down...

--

deejay