"David W. Hankins" <David_Hankins@isc.org> writes:
On Fri, Sep 05, 2008 at 10:32:46AM -0400, Robert E. Seastrom wrote:
Forwarded to NANOG in the interests of wider awareness... having been there and torn out my already scarce hair, duplicate MAC addresses can really mess up your day...
Out of curiosity, does this happen often enough we might want to consider an automated means to negotiate out of the problem state (e.g. detect collisions and negotiate MAC address by DHCP)?
It would take years to deploy but might save thousands of hairs.
The same DHCP server (ip helper-address blah) serves my office, my home, and the colo. Can you give me an idea of a good heuristic for telling the difference between moving my laptop around and finding MAC address collisions? Or are you suggesting that you hand out a MAC address along with an IP address when the client DHCPs and the client then changes it? -r