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DHCP reservations return 24 hrs. after deletion.

Posted on 2006-11-07
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Last Modified: 2011-09-20
I have a W2K3 standard server that is running DHCP, DNS, and A.D. This server is in a domain that has another D.C. replicating the same information. DHCP reservations are used along side a firewall so that only computers that are grated access can go outside the network. Unfortunately we have to continue using DHCP reservations. When you delete a reservation that reservation comes back in about a 24 hour period. This is fairly recent, but since we don't delete reservations daily, I can't tell precisely when this started. Also there are no warning or errors being produced by any of the servers regarding DNS, FRS, or DHCP errors. If you have any insight, I would be extremely thankful!
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Question by:zhohulin
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Steve Knight earned 325 total points
ID: 17891324
Well DHCP is standalone, not in AD but in the jet databases.  Have you got some procedure that dumps it out of one with NETSH and re-imports it to the other pehaps?

Just an idea but setup a scheduled task which does this every half hour or something for a day or so:

c:
cd \logs
rename dump.txt dump.old
netsh dhcp server dump > dump.txt
echo %date %time% >> changelog.txt
fc dump.txt dump.old >> changelog.txt

Then you can see any  changes to DHCP settings or reservations bein dumped out and compared with the last version.  At least that would narrow down WHEN it is happening and maybe lead to a scheduled task or backup / restore job?

Might be worth reconciling all scopes for now.

Steve
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LVL 43

Expert Comment

by:Steve Knight
ID: 17891414
Actually if you did do that you'd need to delete the old log file too:

c:
cd \logs
del dump.old
rename dump.txt dump.old
netsh dhcp server dump > dump.txt
echo %date %time% >> changelog.txt
fc dump.txt dump.old >> changelog.txt

Steve
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LVL 43

Expert Comment

by:Steve Knight
ID: 19401963
Accept dragon-it would sound like a good plan to me.
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