ddns updates for reserved (fixed-address) IPs

John Miller johnmill at brandeis.edu
Fri Feb 7 16:09:27 UTC 2014

Hello folks,

I'm trying to get a better understanding of how dynamic updates work,
especially as they apply to fixed-address declarations.  In my test system,
it appears that if an address is part of a dynamic pool, its associated DNS
records will be deleted when the IP is freed for use.

With hosts configured using the 'fixed-address' parameter, however,
associated DNS records do not appear to be deleted when the host in
question has its lease expired.

Is this correct?  If so, if we expand a dynamic pool to include some
previously reserved addresses, do we then need to manually clean up DNS to
remove the old fixed-address A and TXT records?

John Miller
Systems Engineer
Brandeis University
johnmill at brandeis.edu
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