Reverse dns problem from bootp

Hello,
we use a software to distribute operating system (with ghost image).
it uses bootp to get IP then begin installation.
The problem is with the reverse dns records. When the installation continues it seems that the computer register itself to the dns with the image name. Then with the true name of the computer.
There is no problem with the forward dns records, but the reverses wasn't  updated.
So there are mulitple computers with the same Reverse dns address. (Our dns servers are windows 2003)
the update ptr option is configured on the dhcp server.
 
TAI-Asked:
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mdcseaConnect With a Mentor Commented:
Enable scavenging on the reverse lookup zone.

Open DNS Manager, expand the server, expand Reverse Lookup Zones
Right-click on the reverse zone holding the stale records, choose Properties
Click on General tab, click on Aging button
Select the checkbox, "Scavenge stale resource records"
Set the No-Refresh and Refresh intervals for the needs on your network
OK, OK and close the DNS Manager
Restart the DNS service.

HTH!
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TAI-Author Commented:
I think we have to change the timing
thank you
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