blake at ispn.net
Tue Aug 18 21:54:43 UTC 2009
>> 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.
> wouldn't that cause IP conflicts, as the new infrastructure wouldn't
> know the old leases?
Yes it would. Shortening your lease times prior to the switch may lessen
the impact, but you'd still have ip conflict issues for the duration of
your lease times even with the ping check enabled.
I think your plan sounds very well thought out. However, I don't have
enough experience in that type of migration to say whether it will work
Another way to go about things is to shutdown C/D, update helper
addresses to A/B/C/D, shutdown A/B, copy the leases file to C/D, start
C/D, update helper addresses to C/D. This also involves some amount if
downtime/impact while you copy the leases file and start C/D. However,
this should be minimal. You can also test if the leases file from A/B
will work on C/D in advance - It should assuming the same or later
version of DHCPD.
It also seems a simpler and more isolated transition because you are not
modifying the config of a working setup to get to your new setup. You
can also revert to the old setup quickly should you encounter a problem.
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