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DHCP Leases As A Result of Workstation RRAS

Posted on 2011-09-16
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Last Modified: 2012-05-12
I have a client that has 50-60 workstations and a handful of servers.  Recently the DHCP pool exhausted IP's and it was discovered that multiple IP's were being used by RAS connections on servers and workstations.  To verify this, I'm able to delete the "Incoming Connections" adaptor on a workstation and the associated DHCP leases disappear on the server.  The next day, the "Incoming Connections" adaptor is back, and of course using IP leases.  I've looked through all GPO's and don't see anything that would do this, maybe I'm just missing it.  Is there anywhere else I should be looking to make sure the adaptors go away and stay away?

Thanks for any tips.
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Question by:SafetyNet-TC
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6 Comments
 
LVL 13

Expert Comment

by:5g6tdcv4
ID: 36551396
lower the lease time on your DHCP server that is supplying IP's to RRAS
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Author Comment

by:SafetyNet-TC
ID: 36557149
I fail to see how that will solve the issue.  The IP's will just be renewed once they reach 50% of their expiry.  Additionally, that doesn't explain why the adaptors are created in the first place.
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LVL 13

Expert Comment

by:5g6tdcv4
ID: 36557432

Let me rephrase this:

What is the DHCP lease renewal on the server supplying IP's to RRAS?
Are these multiple IP's held by the workstation registered in DNS?
If you restart RRAS on the server are these leases dumped?
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Author Comment

by:SafetyNet-TC
ID: 36573901
The DHCP lease renewal is 1 day.  No, the IP's do not get registered in DNS.  The RRAS service on the server is stopped and disabled for now.  Starting/stopping it has no affect on the leases.  It seems coincidental that a lot of the leases were created/expire in the 3-4AM range.  

Thanks for your response.


  DHCP RAS Examples
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Accepted Solution

by:
SafetyNet-TC earned 0 total points
ID: 36574034
I found the GPO causing this.  Not sure how I missed it the first two times I looked.  Thank you for your response, I really do appreciate it.
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Author Closing Comment

by:SafetyNet-TC
ID: 36597740
Self solved.
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