Help with DHCP failover configuration

Phusion phusion2k at
Tue Aug 9 11:38:19 UTC 2011

On Mon, Aug 8, 2011 at 11:07 AM, Chris Buxton <chris.p.buxton at> wrote:
> On Aug 8, 2011, at 8:02 AM, Phusion wrote:
>> I am in need of some assistance with DHCP failover. First of all both
>> of the servers are running 3.1-ESV. I've tried configured the servers
>> to run in a cooperating partner relationship to try and provide both
>> redundancy and load-balancing. As a test, I stopped the DHCP service
>> on the secondary server and eventually started to get messages like
>> this one on the primary server.
>> Aug  8 07:06:59 dhcp01 dhcpd: DHCPDISCOVER from xx:xx:xx:xx:xx:xx
>> (workstation) via fxp0: peer holds all free leases
> This is normal. Put the remaining server into partner-down state, rather than communications-interrupted (which is what you get by default when one server goes down). Otherwise, once you hit the 50% full mark, you might start to see this.
> You should always monitor your DHCP servers to detect when one partner goes down. Usually an SNMP implementation is sufficient, but a log server is also helpful. The log server could be configured to send an alert when either server logs a state change.
> Chris Buxton
> BlueCat Networks
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> dhcp-users mailing list
> dhcp-users at

I will try this. Thanks.


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