Win7 thinks it's connected to TWO networks via LAN cable sometimes

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d4005

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Oct 20, 2014
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I've noticed a few times that upon unhibernation of my Win7 Pro x64 (i7) laptop, instead of the LAN being connected to just my home network, it also thinks it's connected to an unidentified network also. Both have the same IP address. The result of this is that both networks say they can't reach the internet (they show a red "x" in the network map).

To solve this all I have to do is disable the LAN adaptor and then re-enable it, or of course a reboot would have worked also. I see this roughly once every 10-15 unhibernations, so near enough once a week. With such an easy workaround (disabling and re-enabling the LAN adaptor) I'm not going to likely go to a huge effort to resolve it. The workaround takes 10 seconds once a week. Even writing this post I'm already down on the deal to the tune of half a year, but I'm doing it during a (paid) meeting so it's just about worth it.

Does anyone know how this can happen and if there's some setting I can change to stop it. The LAN adaptor is a Realtex PCIe GBE and it's running at 1Gbps connected to a Fritz.Box 7490 Router on a 1Gbps port. I've only got one LAN port on my laptop and the wireless and bluetooth are disabled, they're definitely both somehow on the same port. I do sometimes connect to a Cisco VPN (for work) and may possibly make the laptop hibernate while it's active and that could be the cause. I'll try that later and see if that's the trigger to make it happen.

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Solution
K
I am going to throw a different angle here. If this is during paid work time, I am going to ahead and assume you are working in an office with other people too. Since this only happens 6-10% of the times. I believe your DHCP issued IP address is being taken by someone else while the DHCP server thinks your computer has disconnected and gives THAT IP address you had to another person.

If you want to test this out, next time you have this issue. Try this instead:

Go to command prompt (you can do this by going to start menu and typing "cmd" )
Once in command prompt first type:
ipconfig /release

Than type:
ipconfig /renew


If this actually works you can just create a batch file (using notepad) all you need onsite the file is the two...
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qazzi

qazzi

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Apr 1, 2013
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well in hibernation the computer goes to sleep, means the network identification also goes to sleep that's the reason for "unidentified network" although it should automatically re-identify upon de-hibenation. i think this was solve with windows update(if i remember correctly) but which one that i don't remember.
 
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d4005

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Oct 20, 2014
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I've found what really sounds like it could be a solution on this page and this page. It involves gepedit.msc (local policy editor) and the windows settings -> security settings which controls how it deals with unidentified networks. As I said, it only happens once a week or so and therefore it'll take a couple of weeks before I can be sure it's resolved anything.

I've also confirmed that hibernating while the VPN is active has nothing to do with the issue.
 
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qazzi

qazzi

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when i ask around, windows did had this problem and they said what i already told you. (about windows already fix this with the update) if you checked the dates on the windows live forum it was around 2010...
 
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kaleem104

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Oct 12, 2014
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I am going to throw a different angle here. If this is during paid work time, I am going to ahead and assume you are working in an office with other people too. Since this only happens 6-10% of the times. I believe your DHCP issued IP address is being taken by someone else while the DHCP server thinks your computer has disconnected and gives THAT IP address you had to another person.

If you want to test this out, next time you have this issue. Try this instead:

Go to command prompt (you can do this by going to start menu and typing "cmd" )
Once in command prompt first type:
ipconfig /release

Than type:
ipconfig /renew


If this actually works you can just create a batch file (using notepad) all you need onsite the file is the two commands I listed above and save the file type as "all files" and make sure at the end of the file name you have ".bat"

The permanent solution in this scenario would be to just double click the batch file you could create and it will fix your internet issue in a couple of seconds.
 
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Solution
D

d4005

Reputable
Oct 20, 2014
13
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4,510
Thanks Kaleem, I will make a batch file to do a release/renew. I'm not in a office environment though, I'm working from home and have my router set to always give me the same IP address (and even when I don't have it set like that, it always seems to give me the same one anyway).

I think the release/renew should be just as good as a disable/enable of the adaptor though.

@qazzi, I did look for a windows update for it and didn't find one. My realtek driver is also up to date (according to Windows device manager at least).
 
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