Duplicate IP address in Router

Unanswered Question
Feb 5th, 2007


In my Network I have 10 router. new one router add in my network but unfortunate if I assign same IP ( LAN interface) in router which assign another router so what happend ??



I have this problem too.
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mydream1983mai Mon, 02/05/2007 - 03:22

Please can you provide us with more information so that everybody understands the issue more clear.

mahmoodmkl Mon, 02/05/2007 - 03:51


Are they connected to same segment? if they are then ofcourse u will get a conflict IP Address.



iqbalkhan Mon, 02/05/2007 - 22:40


I explain for everyone. if I have network where one pc assign IP if same ip assign another pc then we get conflict message.

Now what happent same sceniro in network router.


I have three router

router1: wan s0/0: ip

Lan e0/0:

router 2: wan s0/0: ip

Lan e0/0:

now router3:

wan s0/0: ip

when assign lan interface ip I put same ip in mistake and assign

Lan e0/0:

so now same ip assign differnt router. now my question is it is show message duplicate IP in console message of router ????.

I think you r understand my question .



royalblues Tue, 02/06/2007 - 08:23


It will not show a duplicate message as the networks are seperated by another discontigous segment.

The problem you will be facing with this will be routing for that subnet.

R3 will think that the traffic for the subnet needs to be sent to its connected interface rather than to the other side of the wan and thus will black hole all traffic

iqbalkhan Tue, 02/06/2007 - 21:57

HI friend

Good Ans. it is problem of routing.

Thanks to all.



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