Migrating config from split-pool to failover

Glenn Satchell glenn.satchell at uniq.com.au
Mon Feb 1 12:36:23 UTC 2010

j.vaningenschenau at utwente.nl wrote:
> Hi,
> We're slowly moving towards using dhcp failover on our subnets. We've
> been running split pool configs for ages but failover seems easier to
> maintain and less error prone.
> At the moment, we configure failover for new subnets, but all existing
> subnets are still split between two servers. Is there a way to change
> these to failover while all clients keep valid leases, ie without using
> temporary addresses?
> btw, still running dhcpd 3.0, will be moving to a newer release in a few
> months (long overdue...)
> Regards,
> Jeroen van Ingen
> ICT Service Centre
> University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users

Hi Jeroen

It should be as simple as making the failover pool be the combination of 
the ranges in the two split pools. Each server will learn about the 
others leases and the current client IPs will be within the range.

The only issue I can see is whether the secondary merges in it's leases 
from the primary, and then sends its leases back to the primary. 
Probably the best way to do this is to create a small pool (say 1 lease 
in each split pool) and test it out.

Glenn Satchell                            |  Miss 9: What do you
Uniq Advances Pty Ltd, Sydney Australia   |  do at work Dad?
mailto:glenn.satchell at uniq.com.au         |  Miss 6: He just
http://www.uniq.com.au tel:0409-458-580   |  types random stuff.

More information about the dhcp-users mailing list