Comments on: How to detect duplicate IP addresses http://itknowledgeexchange.techtarget.com/itanswers/how-to-detect-duplicate-ip-addresses/ Tue, 21 May 2013 08:51:17 +0000 hourly 1 By: blankreg http://itknowledgeexchange.techtarget.com/itanswers/how-to-detect-duplicate-ip-addresses/#comment-67438 blankreg Thu, 27 Aug 2009 06:56:47 +0000 #comment-67438 I believe that a Cisco router sends an ARP for it’s own IP address when they connect to a network, or the IP address is changed. That is how they discover, and you see a message about, duplicate IP addresses as soon as you connect the router to the network, or if you change it’s IP address to one already being used.

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