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DHCP Server claims incorrectly that there are only a few more addresses to give. DNS Zone has multiple pc names to 1 IP address.

Posted on 2004-10-20
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Last Modified: 2010-03-18
Hi,

Not sure if the 2 issues are related. I am running a w2k domain with one DC hosting everything ie DNS DHCP etc. Recently the scope was changed from *.*.*.30 - *.*.*.190   to *.*.*.60- *.*.*.190.

I noticed a warning icon on the DHCP scope and the statistics showed that there were only 4 ip addresses free.  When I checked the leases there should have been at least 40 free. I found an article that said that the addresses may not show as free for up to 4 hours even after they are. I waited 1 day but the problem was still there. I stopped and started the dhcp server - reconciled the scope but problem was the same. Eventually I added another 10 addresses to the scope and the warning went away. Why is this happening and why does it not see the other addresses. The other thing that may be relevant here is that the DHCP server stopped issuing addresses at *.150 and issuing vthem again at 180 . The last addess was 186 and the scope ends at 190 -hence 4 free but what about all the other ones it never issued? I have no reservations setup.

I noticed that my DNS Server has several entries that refer to different computers that have the same ip address! Not sure if this is related to the above problem or why. It would appear that these are machine sthat once got given dhcp addresses but are not currently on the network and the DNS did not delete them.

Many thanks for any help
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Question by:veryfew1
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4 Comments
 
LVL 23

Expert Comment

by:rhandels
ID: 12367377
Hi,

How long is the lease time of the DHCP addresses??
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Author Comment

by:veryfew1
ID: 12374295
The lease time is 8 days
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Author Comment

by:veryfew1
ID: 12377407
Found today that the DHCP server issued 30 odd addresses to no particular machines -ie the DHCP reading was ip address under name and address - none of the ips issued were on the network ping timed out to all of them - they all had the exact lease expiry time. Event viewer did not give me any clues other than the fact that the DHCP server was started at around the time the addresses would have been given out. I deleted the entries and freed up my DHCP Server. Still interested to find out why this happened?
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Accepted Solution

by:
rhandels earned 1500 total points
ID: 12378756
Hi,

Normally a DHCP server only gives out DHCP addresses after gtting an DHCPREQ (Request). It then answers with a DHCPACK (Acknowledgment) end only after these things happen, it should hand out DHCP addresses. My guess is that some pc (or something like that) requested a lot of IP addresses end that's why it gave out these addresses. The actual reason for this will remain uncertain... Maybe we could give a call to Sculder and Mully...
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