DS Forums

 
 

Computer changed to weird IP address


Reply
Thread Tools Search this Thread
Old 07-12-2016, 20:45
_ben
Forum Member
 
Join Date: Sep 2004
Posts: 4,719

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?
_ben is offline   Reply With Quote
Please sign in or register to remove this advertisement.
Old 07-12-2016, 21:33
bob187
Forum Member
 
Join Date: Dec 2007
Posts: 1,127
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.
bob187 is offline   Reply With Quote
Old 07-12-2016, 21:53
_ben
Forum Member
 
Join Date: Sep 2004
Posts: 4,719
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.
I don't remember the full address (I only noticed it wasn't 192.168 or 10.0), but 169 does look familiar so I think that's the explanation. There are no other DHCP servers on the network. Thanks for the help.
_ben is offline   Reply With Quote
Old 07-12-2016, 22:11
Thine Wonk
Forum Member
 
Join Date: Mar 2009
Posts: 14,541
So in other words you got an APIPA.
Thine Wonk is offline   Reply With Quote
Old 07-12-2016, 22:20
_ben
Forum Member
 
Join Date: Sep 2004
Posts: 4,719
So in other words you got an APIPA.
Looks like it. I didn't actually know Windows did that so I've learnt something today.
_ben is offline   Reply With Quote
Old 07-12-2016, 22:50
Sexbomb
Forum Member
 
Join Date: Jan 2006
Location: Lancs
Posts: 14,452
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.
Sexbomb is offline Follow this poster on Twitter   Reply With Quote
Old 08-12-2016, 00:34
Thine Wonk
Forum Member
 
Join Date: Mar 2009
Posts: 14,541
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.
That's because you've statically assigned 2 items with the same IP or you have a DHCP misconfiguration issue. I'd look at your DHCP settings and put them all on dynamic and also check Windows settings and other devices to check you haven't assigned static IPs.
Thine Wonk is offline   Reply With Quote
Old 09-12-2016, 23:23
_ben
Forum Member
 
Join Date: Sep 2004
Posts: 4,719
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/
_ben is offline   Reply With Quote
Old 10-12-2016, 18:36
_ben
Forum Member
 
Join Date: Sep 2004
Posts: 4,719
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/
This seems to be affecting a lot of people
http://www.infoworld.com/article/314...nnections.html
_ben is offline   Reply With Quote
Old 12-12-2016, 21:48
_ben
Forum Member
 
Join Date: Sep 2004
Posts: 4,719
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/
_ben is offline   Reply With Quote
Old 12-12-2016, 22:25
LION8TIGER
Forum Member
 
Join Date: May 2005
Posts: 7,975
Did you run the 2 netsh commands, did it fix it ?
LION8TIGER is offline   Reply With Quote
Old 12-12-2016, 22:35
_ben
Forum Member
 
Join Date: Sep 2004
Posts: 4,719
Did you run the 2 netsh commands, did it fix it ?
I just restarted the computer instead. If it happens again I'll try the netsh commands.
_ben is offline   Reply With Quote
Old 13-12-2016, 05:54
Stig
Forum Member
 
Join Date: Sep 2003
Location: Sandy Heath, Beds. UK
Posts: 10,374
I saw this on my PC yesterday: the network card was using an APIPA address. A reboot fixed it first time for me.
Stig is online now   Reply With Quote
 
Reply




 
Forum Jump


All times are GMT. The time now is 10:02.