At 01:09 PM 4/12/01, McCallum, Robert wrote:
>Here is a scenario which caught me out BIG time in a real life situation
>using ISIS.
>
>To make it easier
>
>Router A has a serial connection to Router B
>
>
>Everything is up layer 1 & 2i.e CDP can indeed see Router B if you are on
>Router A and vice versa. Router B can't see any routes from Router A or
>beyond.
>
>NOW Routers A serial 0's ip address is 172.16.130.5, Routers B serial 0's
>ip address is 172.16.130.5.
>
>Spot the deliberate mistake.
>
>Although you say AHA he has the same ip address on the serial connections.
>SO, quite rightly ISIS says, go away I will never make an adjacency with
>myself !!!! :-(
>
>However, it took me quite a while to discover that these IP addresses were
>indeed duplicated.
>
>REASON or should I make it a question? I think question would be better.
>
>Q: What do you think would happen if I was on Router A and telnetted to
>172.16.130.5, would I telnet to Router A or B. :->
I think I saw something similar today, though not with ISIS. But duplicate
IP addressing caused us to Telnet to ourselves (i.e. Telnet from Router A
to Router A.) Troubleshooting went downhill for a while until we figured
out that was what was happening.
Is that what you saw too?
Thanks for the cool scenario. I hope the customer stopped breathing down
your back finally.
Priscilla
>A: This is why it took me a while to realise this. I started debugging
>adjacencies, blaming a new controller card which was the first time I had
>used this in ISIS, everything bar the easy problem. Mental Note for me here
>is don't dive in head first, always fault find the layers and remember this
>fault because it is nasty!!!! :-
>What made it worse was the customer sitting over my shoulder saying WHY
>isn't this working, I knew we shouldn't have bought those new fangled router
>things!!!!!
>
>Oh the joys of life!!!!
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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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