>A loopback interface is basically ina network of it's own. it is not
>connected to another Interface nor does it particcipate in the transport of
>data (in it's normal form atleast.) However it is used (specially in a
>dynamic routing enviro) as a "reliable Interface" since it would be
>available as long as at least one interface on the unit is up.
>Now for the /32 mask. Well why waste more IPs than needed. All you need is
>1 is this "broadcast domain" there is nothing else connected to this
>interface physically.
OSPF has special treatment for /32 host routes, so I tend not to use
them for loopbacks -- the entries in the link state database can look
weird otherwise. I've also seen some weirdnesses with /30, so I'm apt
to use a /29 subnet.
I wouldn't want my loopback addresses accessible from the public
internet, so I will use private space -- and am not very worried
about conserving it.
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