best practice for moving subnets?

Tom Schmitt TomSchmitt at
Tue Nov 16 16:48:19 UTC 2010


I want to move a few subnets from one dhcpd failoverpair to another dhcpd failoverpair and was asked if I could do that without causing the dynamic clients to loose their connection to the network (or their ip address).

My question: Is there a best practice for such a task?

The straight forward approach, simply deleting the config on the first pair and adding it on the other and then changing the ip-helper-addresses on the router, would cause all the dynamic clients to request new IP addresses which means loosing their existing network sessions.

The second strategy that comes to my mind (shutting down all dhcpd, cutting all leases from these subnets out of the leasedatabases from the old pair and add them to the leasedatabases of the new pair. Then start all four dhcpd with the new config again) would mean a long downtime of all dhcpd which seemes to be not acceptable.

Is there any other strategy you could suggest?

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