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Computer changed to weird IP address |
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#1 |
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Forum Member
Join Date: Sep 2004
Posts: 4,719
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Computer changed to weird IP address
Yesterday my internet connection stopped working, I logged into my router to see what was going on and it reckoned the internet was fine, but I noticed that the IP address it had for my computer was outside of the DHCP range, in fact it was outside of the subnet altogether. I rebooted the computer, the router allocated it a sensible IP address and the internet worked fine. My question is, what could have caused the computer to be allocated an IP address in the wrong subnet?
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#2 |
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Join Date: Dec 2007
Posts: 1,127
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Was the address in the 169.254.xxx.xxx range?
This is an APIPA address that your PC would have automatically assigned to itself in the event that it didn't receive a reply from your router. If this was the case, it's likely that your router rebooted (or froze and then later recovered), during which time your PC requested an IP address renewal If the IP address was not in this range, the only other likely explanation is that there was another DHCP server on your network, and this had supplied a new IP to your PC. If you can't think of a way this could have happened (plugged in a new NAS, tried to use a router as a wireless extender etc) then I'd think about changing your SSID, or look at any powerline adapters (homeplugs) if you have any. Hope this helps. |
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#3 |
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Forum Member
Join Date: Sep 2004
Posts: 4,719
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Quote:
Was the address in the 169.254.xxx.xxx range?
This is an APIPA address that your PC would have automatically assigned to itself in the event that it didn't receive a reply from your router. If this was the case, it's likely that your router rebooted (or froze and then later recovered), during which time your PC requested an IP address renewal If the IP address was not in this range, the only other likely explanation is that there was another DHCP server on your network, and this had supplied a new IP to your PC. If you can't think of a way this could have happened (plugged in a new NAS, tried to use a router as a wireless extender etc) then I'd think about changing your SSID, or look at any powerline adapters (homeplugs) if you have any. Hope this helps. |
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#4 |
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Forum Member
Join Date: Mar 2009
Posts: 14,541
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So in other words you got an APIPA.
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#5 |
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Forum Member
Join Date: Sep 2004
Posts: 4,719
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Quote:
So in other words you got an APIPA.
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#6 |
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Forum Member
Join Date: Jan 2006
Location: Lancs
Posts: 14,453
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I always get an annoying ip address conflict sometimes on my pc and why windows does it i don't know, tv, printer, mobile phone all using the wireless network. I may suddenly get a conflict then the internet loses connection with the windows bubble pop up.
I then have to open the command prompt a do an ipconfig release and renew to get it working again. |
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#7 |
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Forum Member
Join Date: Mar 2009
Posts: 14,541
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Quote:
I always get an annoying ip address conflict sometimes on my pc and why windows does it i don't know, tv, printer, mobile phone all using the wireless network. I may suddenly get a conflict then the internet loses connection with the windows bubble pop up.
I then have to open the command prompt a do an ipconfig release and renew to get it working again. |
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#8 |
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Forum Member
Join Date: Sep 2004
Posts: 4,719
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Just noticed that an older laptop that I don't use so often is also affected. Looks like it might be something to do with a recent Windows update
http://www.theregister.co.uk/2016/12...etworking_bug/ |
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#9 |
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Forum Member
Join Date: Sep 2004
Posts: 4,719
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Quote:
Just noticed that an older laptop that I don't use so often is also affected. Looks like it might be something to do with a recent Windows update
http://www.theregister.co.uk/2016/12...etworking_bug/ http://www.infoworld.com/article/314...nnections.html |
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#10 |
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Forum Member
Join Date: Sep 2004
Posts: 4,719
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My own ISP (Virgin Media) have also said there's a problem, definitely looking like a Windows Update issue.
http://www.theregister.co.uk/2016/12...ting_all_isps/ |
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#11 |
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Forum Member
Join Date: May 2005
Posts: 7,975
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Did you run the 2 netsh commands, did it fix it ?
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#12 |
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Join Date: Sep 2004
Posts: 4,719
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Quote:
Did you run the 2 netsh commands, did it fix it ?
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#13 |
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Forum Member
Join Date: Sep 2003
Location: Sandy Heath, Beds. UK
Posts: 10,377
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I saw this on my PC yesterday: the network card was using an APIPA address. A reboot fixed it first time for me.
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