See lines below.
""Susan Stone"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi..
>
> Sorry, I need a few more questions to verify whether my understanding on
> loopback is correct or not? Pls answer it.
>
> 1) If I have two router A (loopback=192.168.0.1/32) and B
> (loopback192.168.0.2/32), Router A's S1 int 100.100.100.1/24 is connected
to
> Router B's S1 100.100.100.2/24. There are no more other connection. If S1
> of B is down. Can I still telnet from A to B using B's loopback address.
No.
>
> 2) If Router A and B have another connection. Router A's S2 int
> 100.200.100.1/24 is connected to Router B's S2 100.200.100.2/24. If S1 of
B
> is down. Can I still telnet from A to B using B's loopback address?
Yes, if you have correct routing entries.
>
> 3) If Router A doesn't have loopback int configured. Can we still telnet
> from A to B?
Of course you can simply telnet into any physical interface that's still up.
>
> 4) Whether the loopback IP address need to be in order or same network?
Let
> say Router A's loopback is 192.168.0.1/32 and Router B's loopback is
> 20.20.20.1/8. Can we still telnet from A to B?
Again, yes, if you have correct routing entries.
>
> 5) If I configured A's loopback IP to be 192.168.0.1/24, can we still
> configured B's loopback to be 192.168.0.2/24? Note: there are in same
> network.
Sure you can since they are in two different routers. I won't recommend
doing this though...
The point is, there is no magic behind a loopback interface as you still
need physical interface and routing entries if you need access.
Richard
>
>
>
>
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