Primary / Secundary cluster with synced leases created using omapi

Matt . yamakasi.014 at
Sat Aug 6 20:48:35 UTC 2016

OK, thanks for that information, that helps.

I have both of my dhcp servers as DHCP-helper in my switches so that
should normally work the way it should.

I need to higher up my logs to see what happens in syncing and will update here.

2016-08-06 22:43 GMT+02:00 S Carr <sjcarr at>:
> On 6 August 2016 at 21:29, Matt . <yamakasi.014 at> wrote:
>> What you say happens, but when I reboot a machine with the secondary
>> dhcp server available only it doesn't get the same IP as it did before
>> failover....
>> You say I should see a refresh of all IP's/Mac as they were assigned
>> on the primary ? I need to check but I don't see that  think.
> Primary should be syncing the leases to the secondary (and vice-versa)
> so both peers have the same MAC to IP mapping for the client. Normally
> DHCPD doesn't purge/reuse IP addresses until it needs to, so as long
> as you have sufficient IP addresses in the subnet then the client
> should get the same IP it had previously.
> If it's not then either your client is changing it's MAC address or
> something else is causing DHCPD to reuse the lease once the client
> releases it on shutdown, so it's not available when it comes back
> online.
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