ddns updates for reserved (fixed-address) IPs

Jim Glassford jmglass at iup.edu
Fri Feb 7 16:44:52 UTC 2014

Hi John,

I am looking forward to other, more knowledgeable replies to this.
I believe you will have to remove/clean-up your static records. We are 
ddns on our WiFi and wired residence hall subnets but do have static 
entries for administrative devices in these subnets. When the static 
devices are added or removed I have to use nsupdate to remove old and 
add the new.


On 2/7/2014 11:09 AM, John Miller wrote:
> 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
> -- 
> John Miller
> Systems Engineer
> Brandeis University
> johnmill at brandeis.edu <mailto:johnmill at brandeis.edu>
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