Sunday, February 19, 2006

 

Duplicate IP address detection. (Question #16)

If you mistakenly configure the same IP address on ethernet interfaces of two different routers in the same subnet you will see a message like the following

*Feb 20 05:42:46.579: %IP-4-DUPADDR: Duplicate address 20.20.20.2 on Ethernet1, sourced by 00c0.3412.0922

How do you think the duplicate address detection is done? Are there any debugs you can turn on on the router to verify if your answer is correct?

Comments:
arp table - debug arp?
 
The duplicate IP address detection is done using gratuitous ARP and "debug arp" will indeed show you that happening.
 
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