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Domain Member fluke didn't follow DHCP

Posted on 2010-09-08
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Last Modified: 2012-05-10
I have a domain member that could not logon today.  When I got in I simply turned off her network adapter and turned it back on (to flush the ip, ect).  I probably could have used ipconfig /release and renew but this seemed faster.

Our gateway is 192.168.2.2 and her ip address was automatically assigned to 169.254.254.208.  Why/How could have this have happened?  Her computer worked fine yesterday and she turned it off last night.  However, when she got in this morning she could not logon to the domain because the ip address was outside the gateway.

Any ideas,
JOe K.
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Question by:ClaudeWalker
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by:Will Szymkowski
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When you get a 169.x.x.x address this is the APIPA address which windows provides when a machine cannot contact the DHCP server. Check the device manager and see if the Network adapter has been disabled or uninstalled.

If this is not the case what you might want to do is check the cable to make sure that it is working properly. Check the patch panel and the port/switch where this user is connected to.
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by:Will Szymkowski
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I would also recommend checking the event viewer to see if there are any errors in there that also might help with this issue. Another thing make sure that the link lights are lit-up and flashing on the back of the NIC. Try uninstalling the NIC from the device manager and reinstalling the card by right clicking on the computer at the top of device manager and click "Scan for hardware changes". This will reinstall the network adapter, then try again.
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by:ClaudeWalker
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So if the computer has an IP designation within the gateway and DHCP range of the server but loses connection, it will abandon the DHCP IP and reassign a APIPA address?
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by:ClaudeWalker
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The LEDs on the back of the NIC are working.  I'll recheck the event viewer but I didn't see anything the first time around.  
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by:ClaudeWalker
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Was this a fluke scenario where her lease was up and then she restarted and didn't have connection?

Is there a way for the server to recognize APIPA addresses and logged on users and reassign an IP within the DHCP range?
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Will Szymkowski earned 500 total points
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There is no way to do this. If you get a 169 IP this means that your windows machine could not contact the DHCP server. If you machine cannot contact the DHCP server how can it renew the IP address lease (it cannot). What you might want to do if this happens only with this user is create a DHCP reservation or set this user up with a static IP address and you should not get the 169 addie anymore. Just remember if this IP is static but there is a network issue then you still will not be able to authenticate.
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by:ClaudeWalker
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Good call on the static IP's.  I've been wanting to move to that for a while because we have a small number of users (45) all in a single location.
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by:ClaudeWalker
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Thanks for helping me.  You were informative and kept with the question.  I appreciate your help.

JOe K.
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by:Will Szymkowski
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Not a problem, glad this info helped you~!
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