DNS mess duplicate entries with different IP

Have a customer with two sites with one DC/DNS server on each site.

Laptop pc's are switching sites on a daily basis. There are lots of duplicate entries where a pc have two or three different ip adresses on the same site. And some ip adresses are listed with two or three different PC-names.

How do I clean up this mess?

I know you guys need more information from me. Just ask for it.
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TANGLADAsked:
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Brian PierceConnect With a Mentor PhotographerCommented:
You need to enable aging and scavenginig of DNS and set the non-reresh and refresh periods to low values - (1 day?). If you are using DHCP you also should reduce the lease period to the same value.

see
http://technet2.microsoft.com/windowsserver/en/library/20fbbd82-0cea-4a74-9634-fdd993f4c4f41033.mspx?mfr=true

http://searchwincomputing.techtarget.com/tip/0,289483,sid68_gci1040355,00.html

http://www.windowsnetworking.com/kbase/WindowsTips/Windows2003/AdminTips/Network/WhentoshortenyourDHCPleaseperiod.html
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TANGLADAuthor Commented:
Thanks for the links.

If the users are switching sites on a daily basis, then how do I best setup the DCHP lease periods and DNS scavenging?

and what happens if a pc's is on one site on the start of the day and then travels to the other site later that day?
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Brian PiercePhotographerCommented:
You need to balance the lease renewal period - too short and you will get lots of renewals (not necessarily a problem), but too long and leases will not be released (more of a potential problem). You could start by opting for a 4hr lease and see how it goes. The the normal advice then would be to set ageing and scavenging to match.
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TANGLADAuthor Commented:
Ok you say a 4 hr lease in DHCP

And then a 4 hr DNS no-refresh interval

And how about the DNS refresh interval?
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Nelesh_NCommented:
We had a situation where the dhcp lease period was set to 8hrs and someone set the no refresh interval and refresh interval to 8 this caused lots of issues wheer dns entries were deleted. Prod systems went down and caused alot of problems.
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