help with DNS and a domain migration

jsctechy
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hey guys, had a question about domain migrations and DNS
we have 2 domains (domaina.com and domainb.com, they are setup with a trust)
to make a long story short, we are migrating all computers from domaina to domainb
the thing is, when we do, domaina still has host records that map the IP of the machine to the old scheme (lets say wks1, as opposed to the new scheme of wks1-ny)
so, we have 2 hostnames, for 1 ip
creating major network issues for programs that use dns (remote admin software, management software, etc)
looks like what we have come up with so far, is that we can run a gpupdate /force on the machines, but this will require the user to re-login, also, we have 200 pcs to do this for... any ideas?
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Top Expert 2012

Commented:
You can setup DNS Scanvaging to remove all stale records which pertain to the old IP scheme or you can manually delete each record.

http://technet.microsoft.com/en-us/library/cc757041(WS.10).aspx
Be careful with scavenging. Make sure all your static IPs (servers, etc) don't have a time to live timestamp.
jsctechyInfrastructure Team Lead

Author

Commented:
i assume i would set that up in DHCP? (the timestamp?)
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No, it's a checkbox on the DNS record. If you have windows servers with a static IP, that record will be scavenged unless the record was manually created, or the server has been rebooted recently enought that it has had it's ip address reregistered in DNS.
jsctechyInfrastructure Team Lead

Author

Commented:
is this the update pointer record check box?
It's the Delete this record when it becomes stale check box. You have to be in advanced view. View -> advanced.
jsctechyInfrastructure Team Lead

Author

Commented:
ahh... nice, thanks
so im guessing uncheck this box and then set the ttl to 0?
You don't have to change the ttl, just uncheck the box, and the record won't be scavenged.
I feel I need to point this out every time someone on EE mentions scavenging. A few years ago I scavenged the record for every single windows server in my company. That was not a fun day.
jsctechyInfrastructure Team Lead

Author

Commented:
yikes.
so all static IPs should not be scavenged? is that the only pre req?
Basically. Definitely check out the link in the first response. Aging and scavenging is a lot more complicated than it sounds.
jsctechyInfrastructure Team Lead

Author

Commented:
thanks dude,

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