dns records not updating when their ip changes at a different site

some of my  users dns records are not updating when their ip changes at a different site.
when a user moves around different sites and they pick up a new ip the dns record for the computer is still pointing to their old ip address
why are these not updating on the dns server when the move around company sites
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dougdogAsked:
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n2fcCommented:
If they are assigned by a DHCP server and are not static, yes they will change...

DNS is NOT an automatic update!

If they are all under the realm of a single DHCP server, it must assign STATIC IP addresses (usually based on MAC id).
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dougdogAuthor Commented:
all addresses are assigned by a dhcp server
there is a dhcp server at each site
but a user that connects at site b on friday and then is at site b on monday still has the dns record pointing at the site a
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Leon FesterSenior Solutions ArchitectCommented:
There are a few reasons.

Dynamic updates is not configured so your DHCP server isn't trying to update the records.
Your permissions on the records could be incorrect so the computers do not have permission to update their own DNS records.
Or a combination of both of the above.
http://technet.microsoft.com/en-us/library/cc753014.aspx

A quick check would be to open the DNS console, browse to a DNS record that is not being updated.
Open the properties and view the security tab.
Check the list of entries that have full access/modify permissions.

If you don't see mycomputer$ then mycomputer cannot update those records.
A quick fix is to delete the records after hours.
Any Windows workstation that is online will re-register his DNS one every 24hours.
Every Windows server should every 15 minutes.

All will re-register when the netlogon service is started, so either restart the netlogon service or tell the users to reboot.
If I want to do this then I usually tell the users that I'm doing some network changes, which requires that their machines are off.
That way users shutdown their PC's and restart the next morning meaning new Record registration.
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dougdogAuthor Commented:
the security looks ok
and dynamic updates are enabled
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Leon FesterSenior Solutions ArchitectCommented:
Try deleting one of the records and check if the workstation re-registers correctly.

Otherwise go through these posts for additional troubleshooting steps.
http://social.technet.microsoft.com/Forums/en/windowsserver2008r2networking/thread/ba9b3798-b0e6-4d5f-ba75-a4b812277f70
http://forums.techarena.in/windows-server-help/1064205.htm
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Ayman BakrSenior ConsultantCommented:
As a test check if the workstations re-register correctly with:
ipconfig /registerdns
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dougdogAuthor Commented:
if i reduce dhcp lease to 1 day this fixs the problem
the problem is if they get an ip address at site a and register a dns record
they keep this for 8 days and will not update till they get a new ip
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dougdogAuthor Commented:
the other soloutions were incorrect
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