Recently I was trying to create a reservation for a MAC address in DHCP, Upon trying first I got an error “The specified address is not available”, I tried multiple times but was not able to create the entry even with a different set IP address. I re-validated the current reservation and leases but the specific Mac address isn’t listed.
Upon further investigation I found that this MAC is somehow mapped to another reservation and isn’t visible, in a way its lingering.
Here is what we did to resolve the issue
1) We took a dump of DHCP configuration using the following command
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