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DHCP Not Handing out Certain Addresses

Posted on 2010-09-01
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Last Modified: 2012-05-10
We're running a DHCP server on a Windows Server 2003 computer.  The scope is from 192.168.0.28 - 192.168.0.155.  In the event viewer there is a message that there are no more addresses available to hand out and that all the addresses are leased, yet there are some addresses within the range that aren't listed as leased and that aren't reserved.  Why would the server not hand out these addresses?  
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Question by:Declan_Basile
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7 Comments
 
LVL 6

Expert Comment

by:rnicolaus
ID: 33578543
can you at least temporarily create another pool of 10 or so addresses and have a retry?  We'll see if there is a problem on the server end.
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Author Comment

by:Declan_Basile
ID: 33579495
How will the server decide which pool to hand out an address from if both pools have available addresses?  Is there a way to tell the server to give out a leased address to a different computer if there aren't any more addresses available and the computer that has the address isn't currently connected?
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LVL 6

Expert Comment

by:rnicolaus
ID: 33579804
No way to give out an address if all are taken from the pool, unless you make a reservation for the particular computer NIC's MAC address.  Do you need to know how to do that?
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LVL 1

Author Comment

by:Declan_Basile
ID: 33580864
I know how to do that.  My issue is that there are 9 addresses that are neither reserved nor leased.  Why is the DHCP server not handing out these addresses?  I just "reconciled" the scope and the list of 9 addresses appeared.  Then reconciled it again and the second time it said that the database was consistent with the registry.  I looked at the statistics.  It says that all 108 addresses are used.  I have a range of 192.168.0.28 - 192.168.0.155 (128 addresses - 20 reserved addresses = 108).  I physically counted each entry in the list of leases and there are only 99 leases.  It should have 9 more addresses to hand out.
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LVL 6

Expert Comment

by:rnicolaus
ID: 33581632
Are you sure there are no exclusions?
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LVL 6

Expert Comment

by:rnicolaus
ID: 33581642
If you accounted for all the IP addresses handed out, which ones are not being assigned?
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Accepted Solution

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Declan_Basile earned 0 total points
ID: 33587887
Some time after reconciling,  the 9 addresses showed up in the list of leased addresses.  For each lease, the computer name was the same as the IP address.  I deleted the leases.  They never came back and now it's handing out addresses.  I had to reconcile and then delete the entries to fix the problem.  
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