Server 2003 DNS Scavenging


I have a Server 2003 Domain Controller, running DHCP and DNS and I am
trying to scavenge old PTR records and a few duplicate A records. My
question is if my DHCP lease is for 12 hours, do I still leave the
Scavenge settings to the default of 7 days for No Refresh, 7 days for
Refresh and 7 Days for scavenge (main Server setting - not for zone) I
get concerned due to the short lease duration for ip addresses and the 7
day No Refresh interval. My understanding is for the 'No Refresh'
interval, no updates happen to change the timestamp only until after No
Refresh ends then the records can be updated for the timestamp ( Refresh
Interval). After those 7 days, then they become eligible to delete. I
realize it's very important to not have the scavenging time to one day
due to servers refresh the timestamps (records) once per 24 hours.

I do not want to delete a server record that is not suppose too. Is 7
day default setting safe for server entries?

Here is one article I read but it did not mention about lease duration
differences.

http://blogs.technet.com/networking/archive/2008/03/19/don-t-be-afraid-of-dns-scavenging-just-be-patient.aspx


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