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ONA Configuration

DHCP failover is built into the core of ONA. To enable DHCP failover for a DHCP pool you must do the following:

In the admin menu Menu->Admin->Manage DHCP failover groups you must select two existing hosts to be part of the failover pair.
Select your desired Split value. The default will put all IPs from a /24 bit subnet on the primary host. Another common value is 128 to split evenly between both primary and secondary hosts.
Adjust any other values as needed but usually the defaults are sufficient.
Now either add a DHCP pool or edit an existing one and select this failover group for the pool.
Remember that a subnet should have at least a default gateway DHCP option allocated for it to show up on the server. The subnet/pool will automatically be added to the hosts defined in the failover group.
That should be it. Also ensure any firewall rules are updated so that failover traffic will flow between the peers on ports 647/847.