problem with dhcp failover

[Simon Hobson]

Julie Xu <J.Xu at westernsydney.edu.au> wrote:

> If it is the case, is possible to config hot standby for failover?
> 
> And what will happen than?

As in, running one server and if that fails, fire up a replacement (with same config and copy of the leases database) ?

Yes you can do that, keeping the config file up to date is fairly easy - keeping the leases file in sync is harder.
How up to date it needs to be to avoid significant problems depends a lot on your network and how it's used. For a stable network with little client churn then you don't need the leases file to be very up to date. For a volatile network then you really need a veery recent copy of the leases file.

It's probably easier to use failover - that way, the servers automatically sync the leases. If you are confident in your network topology, you could set the automatic partner down mode - otherwise just have network/server monitoring that will alert you to one going down so you can manually put the other into partner down mode.