migration suggestions

[sthaug at nethelp.no]

> I have a failover pair of dhcp servers running ISC DHCP version 3.1.2p1,
> let's call then "A" and "B"  There are about 130 subnets, on 106
> different routers, served by these two dhcp servers  For various reason,
> I need to migrate to a new set of servers, let's call them "C" and "D",
> and the IP address of "C" and "D" can't be the same as "A" and "B".
> 
> What would be the cleanest way to transition from the first set to the
> second?  I'm envisioning something on the order of:

If your clients depend on reasonably continuous service, you'll have
to do something along these lines.

If your clients can live with some downtime (remember, this will only
affect *new* clients which don't already have a lease), you can shut
down everything and move it all in one go.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no