option dhcp-server-identifier

John Ratliff jratliff at bluemarble.net
Wed Oct 12 02:39:51 UTC 2016

I have a pair of isc dhcp servers, version 4.3.1 on Debian 8 Jessie.

I do not want to use the DHCP failover protocol. Instead, I want to use a
virtual IP on the primary active server, and have the backup server
shutdown. I have a cronjob to sync the lease file automatically, but
failover will be strictly a manual process.

It seems that the running server always sends packets from the primary IP
on the NIC, and sets the dhcp-server-identifier option to this IP. So when
a DHCP client tries to renew, if the server has changed, it takes quite a
while before the client realizes this. If I could change the packet and
the dhcp-server-identifier to be the virtual IP, the clients wouldn't have
this problem.

Is there a way to configure this in isc-dhcp?



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