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Windows 2003 DHCP Server, how to change scope percentage full warning threshold

Posted on 2009-07-15
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Last Modified: 2012-05-07
I need to change the "DHCP scope 0.0.0.0 is xx% full" warning trigger level from the default of 80%.  I've found info on how to do this before, but for the life of me I can't find it now, either here or elsewhere.  I think it was a registry key change but I might be misremembering.

Can anyone point me in the right direction?  Thanks in advance.
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Question by:IT-Monkey-Dave
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I found it:
http://blogs.msdn.com/anto_rocks/
How to override the system default for the threshold for the event 1020.
Question: How can I change the threshold value for firing of event 1020. Event 1020 fired by the DHCP server is fired whenever the amount of free addresses in a scope is less than 80%.
E.g:
Event Type:     Warning
Event Source:   DhcpServer
Event Category: None
Event ID:       1020
Date:           3/08/2005
Time:           19:50:48
User:           N/A
Computer:       NETSERVER
Description:
Scope, 10.156.32.0, is 81 percent full with only 35 IP addresses remaining.
For some people they might want to change this threshold value of 80%. For them firing this warning at 90% might make more sense of it the threshold could be lower that 80%. For these purposes, to override the system default of 80%, what can I do?
Answer:I believe there is indeed a registry key which can override the default threshold for logging event 1020. The reg key is named "DhcpAlertPercentage" and is of type REG_DWORD. You can create it under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dhcpserver\Parameters. Posted by anto_rocks | 0 Comments  
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