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Albert WidjajaFlag for Australia

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Enabling DNS Scavenging and DHCP Dynamic updates risk and steps ?

People,

Can anyone here please share what's the steps and the risk when enabling this nice feature in both DNS and DHCP servers ?

Because in my AD joined workstations, there are so many confusion in regards to pinging DNS name (FQDN) returning old or different AD computer name.

what my concern in enabling DNS scavenging in all AD Integrated DNS Server and DHCP servers, does it impact the current server DNS entries that are still online or pingable?

I'm trying to avoid any outage or issue when enabling those two features in all of my DNS servers one by one for the entire AD domain.
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max_the_king

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Max, what would be the counter effect ?
Care to share please...
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Hy i use in my enviromment, and never had problem.
OK, so do I just enable it straight away on both server at the same time or should I just enable it one by one ?
eg. Scavenging first or DHCP dynamic update first ?
Personaly i will do DNS first
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max_the_king

Hi,
you should tune parameters as indicated here:
http://www.dell.com/support/article/it/it/itbsdt1/sln290564/windows-server--best-practices-for-implementing-dns-aging-and-scavenging?lang=en

at the end you'll eventually get the job done anyway ... just keep in mind that youl'll get records pruned as dhcp registration updates.

max
OK, I will do the DNS scavenging change first in the first week, and then followed by the DHCP dynamic update.
Do I need to shorten the DHCP lease from 5 days into just 8 hrs in the next week ?
should be good
max
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OK, regarding the DNS scavenging, does it only deletes the name (A Record) and CName record that is no longer pingable from the DNS server ?
or will it delete the DNS record with conflicting IP address as well ?
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OK, does enable DNS scavenging can cause the existing DNS entry that is used by a server to be deleted?
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