Problem withIP Address scope on the Network

July 11, 2011 at 10:44:12
Specs: Windows XP
My Network is running Windows Server 2003 and with more than 150 Users. But last week, I notice that a program is changing my DHCP server IP Address scope. Example, my internal address scope is as follows:
IP Address:
Subnet Mask:
But surprisingly, last week, I keep seeing systems having IP address like this :-
IP Address:
Subnet Mask:
Gateway: and so on.
Immediately I noticed this, I scanned my DHCP Server with NOD32 Smart Security and McAfee antivirus solutions and they found no threat. I use malwarebytes and it discovered nothing but the problem still remains. How do I resolve this problem?
The only way I connect some system now to access Internet is manual configuration.
Is formatting and restoring the DHCP Server the only way out of this mess? Please, I need your help.

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July 11, 2011 at 11:27:37
The address scope that you give covers addresses in the range - So what's the problem?

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July 11, 2011 at 11:50:06
Perhaps you meant to use a subnet mask which would result in -

Should be a simple matter of changing the subnet mask in dhcp as well as all statically assigned devices.

Your ip assignments /dhcp has nothing to do with a machine not getting internet access. You have a valid gateway.

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