A loopback is a logical interface that never goes down. It's used for
various reasons (for setting up various kinds of tunnels, for setting who is
the DR/BDR in OSPF, etc). It can be set to any valid IP in your network,
not just private. Many people use the subnet mask 255.255.255.255 because
that's the only way to assign a single IP to the lookback instead of using
more than 1 IP address.
Mike W.
"Susan Stone" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi,
>
> I always wonder what is loopback interface for? Can anyone explained its
> function? Can we don't configure the loopback interface. Our WAN Lookback
> always start with 192.168.X.X why? Must we use private IP? I found I can
> telnet to a remote router using its loopback IP. But I wonder How I route
> as it always have the subnet mask of 255.255.255.255. Then which is the
> network and which the host
>
> Susan
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