Static IP Conflict Detection ...
I have noticed that Windows 7 does not detect when an IP conflict occurs while the system is operational with the IP configured. For instance, I have my Windows 7 operating configured with a static IP. Connectivity is fine. Then I connect another system to the network with the same IP. Windows 7 does not provide a notification that an IP conflict was detected nor is it recorded in the Windows System log. I do see the notification and log event if I disable and enable my network adapter. Is this the intended behavior? This could become a big issue depending on the critical nature of that system and the fact that this scenario is simple and common to occur. SCENARIOS: 1) Unplug my network cable. Bring up another system on the network with my IP. Plug my network cable back in. RESULT: A notification is presented about the conflict. My network address changes to the default internal scheme for unresolved IPs. An event is logged in the Windows System log regarding the event. 2) Open my network properties and change my IP address to an IP address of a system already on the network. Accept changes. RESULT: Same as the first scenario. 3) Ensure my system is in an operational state on the network (e.g. can access other network devices). Then connect another system to the same network with the same IP address as my system. RESULT: Nothing. No notification. No events logged. No change in IP address.
September 23rd, 2011 6:45pm

in case (3) when you connect another system, you plug its cable in - and this becames case (1). -- pa
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September 26th, 2011 1:59am

Hi, As Pavel A says, the case 3 is same as case 1. I also tested as you said, but I can always receive the IP conflict notification. You may try to run Ipconfig/all to check whether the IP status is duplicate.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
September 29th, 2011 11:46am

Hi, As Pavel A says, the case 3 is same as case 1. I also tested as you said, but I can always receive the IP conflict notification. You may try to run Ipconfig/all to check whether the IP status is duplicate.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
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September 29th, 2011 11:46am

This would be true if all networked devices connecting to a network were powered by Windows 7, but this is not the case.
September 30th, 2011 1:06pm

Hi, Whether the status of the IP address is dulpicate? If so, this means the IP address is conflicting.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
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October 2nd, 2011 10:23pm

Hi, Whether the status of the IP address is dulpicate? If so, this means the IP address is conflicting.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
October 3rd, 2011 5:13am

I got the same question and I don't know why. Exactly the case 3 situation! With the same static ip address configuration, the original computer does not detect an ip conflict event, but the computer that attempted to use the same ip address configuration can detect the ip address conflict and it can be found in the system event log. It is boring!
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January 4th, 2012 1:28am

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