I have seems some routers with many lookback interfaces configured. May I
know what is the purpose to have so many lookback? I thought one loopback
can help us to troubleshoot the connectivity
Besides, I am interested about question 5 from Richard, you said the
lookback IPs within same network can be configured on different router.
Does it mean that if we configured many lookback interfaces, those IPs must
be in different network. for example 192.168.101.101/24 192.168.102.102/24.
But Any one know what is the reason??
> 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
-----Original Message-----
From: Richard Chang [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 28, 2001 1:51 AM
To: [EMAIL PROTECTED]
Subject: Re: what is loopback interface for ? [7:9493]
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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