DuBoisCG
asked on
Computers assigned wrong IP addresses
Our networked computers have suddenly started showing IP addresses of 192.168.0.xxx instead of .1.xxx. The router is 192.168.1.1 (I am typing this on the last computer working).
Even the hard-wired computer is being assigned the bogus address. Any ideas?
Even the hard-wired computer is being assigned the bogus address. Any ideas?
Try to see if the Dhcp server have the wrong mask 255.255.0.0 or something like that
ASKER
The Linksys router has correct mask (see attached).
router.jpg
router.jpg
If you do an ipconfig /all, it will show the DHCP server. Perhaps there's a rogue device on your network giving out DHCP leases.
Make sure that you have configured the dhcp server of the router to offer an range of right ips from DHCP tab in your router you can send your router model to send you screen shots
ASKER
THERE ARE SOME DIFFERENCED BETWEEN A WORKING AND NON WORKING COMPUTER.. I PUT THOSE IN CAPS SEPARATED BY LINES OF ******************.
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Herb>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : HerbLaptop-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : cable.rcn.com
Ethernet adapter Local Area Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : cable.rcn.com
Description . . . . . . . . . . . : Realtek RTL8102E/RTL8103E Family PCI-E Fa
st Ethernet NIC (NDIS 6.20)
Physical Address. . . . . . . . . : 00-26-9E-A5-EE-F0
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter Wireless Network Connection 2:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
Physical Address. . . . . . . . . : 96-4C-E5-37-84-28
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter Wireless Network Connection:
Connection-specific DNS Suffix . : cable.rcn.com
Description . . . . . . . . . . . : Atheros AR9285 802.11b/g/n WiFi Adapter
Physical Address. . . . . . . . . : 90-4C-E5-37-84-28
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2002:4079:4c8b:1234:c8cd:7 b9d:be28:4 a03(P
referred)
Temporary IPv6 Address. . . . . . : 2002:4079:4c8b:1234:f417:b 38e:70e6:f c4c(P
referred)
Link-local IPv6 Address . . . . . : fe80::c8cd:7b9d:be28:4a03% 12(Preferr ed)
IPv4 Address. . . . . . . . . . . : 192.168.1.106(Preferred)
************************** ********** ********** ********** ********** ***
COMPUTER NOT WORKIING HAS 192.168.0.1 HERE
************************** ********** ********** ********** ********** ********
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Saturday, September 04, 2010 4:14:47 PM
Lease Expires . . . . . . . . . . : Wednesday, September 15, 2010 3:14:36 PM
Default Gateway . . . . . . . . . : fe80::200:ff:fe00:0%12
192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
************************** ********** ********** ********** ********** **
NON WORKING COMPUTER HAS 192.168.1.101 HERE
************************** ********** ********** ********** ********** ***
DHCPv6 IAID . . . . . . . . . . . : 328223973
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-12-FB-BD-79-00 -26-9E-A5- EE-F0
DNS Servers . . . . . . . . . . . : 208.59.247.45
208.59.247.46
192.168.1.1
************************** ********** ********** ********** *********
NON WORKING COMPUTER DOES NOT HAVE THE 192.168.1.1 ENTRY ABOVE
************************** ********** ********** ********** ********** ********** ********** *********
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter Teredo Tunneling Pseudo-Interface:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:8b7:bf9:b f86:b374(P refer
red)
Link-local IPv6 Address . . . . . : fe80::8b7:bf9:bf86:b374%14 (Preferred )
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter Local Area Connection* 12:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.{1421200B-7791-44E4 -BA9A-AA5C BC977EF1}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.cable.rcn.com:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : cable.rcn.com
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
C:\Users\Herb>
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Herb>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : HerbLaptop-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : cable.rcn.com
Ethernet adapter Local Area Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : cable.rcn.com
Description . . . . . . . . . . . : Realtek RTL8102E/RTL8103E Family PCI-E Fa
st Ethernet NIC (NDIS 6.20)
Physical Address. . . . . . . . . : 00-26-9E-A5-EE-F0
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter Wireless Network Connection 2:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
Physical Address. . . . . . . . . : 96-4C-E5-37-84-28
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter Wireless Network Connection:
Connection-specific DNS Suffix . : cable.rcn.com
Description . . . . . . . . . . . : Atheros AR9285 802.11b/g/n WiFi Adapter
Physical Address. . . . . . . . . : 90-4C-E5-37-84-28
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2002:4079:4c8b:1234:c8cd:7
referred)
Temporary IPv6 Address. . . . . . : 2002:4079:4c8b:1234:f417:b
referred)
Link-local IPv6 Address . . . . . : fe80::c8cd:7b9d:be28:4a03%
IPv4 Address. . . . . . . . . . . : 192.168.1.106(Preferred)
**************************
COMPUTER NOT WORKIING HAS 192.168.0.1 HERE
**************************
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Saturday, September 04, 2010 4:14:47 PM
Lease Expires . . . . . . . . . . : Wednesday, September 15, 2010 3:14:36 PM
Default Gateway . . . . . . . . . : fe80::200:ff:fe00:0%12
192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
**************************
NON WORKING COMPUTER HAS 192.168.1.101 HERE
**************************
DHCPv6 IAID . . . . . . . . . . . : 328223973
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-12-FB-BD-79-00
DNS Servers . . . . . . . . . . . : 208.59.247.45
208.59.247.46
192.168.1.1
**************************
NON WORKING COMPUTER DOES NOT HAVE THE 192.168.1.1 ENTRY ABOVE
**************************
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter Teredo Tunneling Pseudo-Interface:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:8b7:bf9:b
red)
Link-local IPv6 Address . . . . . : fe80::8b7:bf9:bf86:b374%14
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter Local Area Connection* 12:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.{1421200B-7791-44E4
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.cable.rcn.com:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : cable.rcn.com
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
C:\Users\Herb>
ipconfig /flushdns
ipconfig /renew
ipconfig /renew
I would agree with jimmytay7, it sounds like there is another device on the network acting as a DHCP server.
Or...
Do you have your DNS configured? The configuration does not show a DNS configuration listed. If you have a problem try to launch a command prompt and type:
nslookup www.google.com
If is says server timed out or some other error try to type in an IP address in the DHCP configuration. If it comes back with an IP try to type is as an IP in the browser and see if it makes it.
Or...
Do you have your DNS configured? The configuration does not show a DNS configuration listed. If you have a problem try to launch a command prompt and type:
nslookup www.google.com
If is says server timed out or some other error try to type in an IP address in the DHCP configuration. If it comes back with an IP try to type is as an IP in the browser and see if it makes it.
ASKER CERTIFIED SOLUTION
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ASKER
This is just a small home network. We shut down all the Windows 7 computers and everything started working again, so one of those must be configured as a DHCP or be causing some other kind of problem. I'll know in the morning and assign the points.
Windows 7 will not act as a DHCP server by default, chec kif you have any other router/wireless device conected on your network, if yes remove that device from network. send me the ipconfig /all output from 192.168.0.xxx ip assigned system
- Krishna
- Krishna
You could also start a "ping 192.168.1.101 -n 10000"
Each ping should time out.
Then boot each computer and watch the ping. When it starts working, you have your culprit.
If it is a computer, make sure to disconnect it from your network while you check it out, just for safety.
Each ping should time out.
Then boot each computer and watch the ping. When it starts working, you have your culprit.
If it is a computer, make sure to disconnect it from your network while you check it out, just for safety.
ASKER
This seemed to solve the problem (I don't know why yet).
When we shut down the Windows 7 computers, the problem went away. On each Windows 7 computer we did the following:
Go to
control panel/network and internet/Choose homegroup and sharing options
Exit the current homegroup
go to services/ HomeGroup Listener - click properties shut down the service and set startup group to disabled
do the same for HomeGroup Provider
restart
When we shut down the Windows 7 computers, the problem went away. On each Windows 7 computer we did the following:
Go to
control panel/network and internet/Choose homegroup and sharing options
Exit the current homegroup
go to services/ HomeGroup Listener - click properties shut down the service and set startup group to disabled
do the same for HomeGroup Provider
restart
It appears that one of the Windows 7 computers was acting as a DHCP server, as I suggested. Shutting down the DCHP server resolved the issue. I believe my solution answered your question.
ASKER
This issue only applies to Windows 7 and the new HomeGroup provider feature. I found the solution here:
http://www.tomshardware.com/forum/77-63-windows-wired-computer-prevents-wireless-connections-router
I'm not sure why this happens, but any suggestion provided here did not lead me to the solution... the question was why is this happening, not how a computer is assigned an IP address.
http://www.tomshardware.com/forum/77-63-windows-wired-computer-prevents-wireless-connections-router
I'm not sure why this happens, but any suggestion provided here did not lead me to the solution... the question was why is this happening, not how a computer is assigned an IP address.
FYI
After reading this article, it is apparent that the problem is that the Windows 7 computer was setup to share it's internet connection with other computers / devices.
To do this, Windows 7 had to act like a DHCP server to any device that wanted to share it's connection (DHCP request). In that way it could act as a "router" and route the internet traffic from it's shared users (the HomeGroup) to it's live internet connection.
PS - I did not read "Why is this happening?" in the question, I read "Any Ideas?"
After reading this article, it is apparent that the problem is that the Windows 7 computer was setup to share it's internet connection with other computers / devices.
To do this, Windows 7 had to act like a DHCP server to any device that wanted to share it's connection (DHCP request). In that way it could act as a "router" and route the internet traffic from it's shared users (the HomeGroup) to it's live internet connection.
PS - I did not read "Why is this happening?" in the question, I read "Any Ideas?"
ASKER
Actually, this problem has yet to be addressed in a MSKB article, so I'm not sure what the problem is. If you bought 2 brand new Windows 7 computers, they wouldn't both act like a DHCP... I just don't accept that Windows 7 is defaulting a workstation to be a DHCP... there is obviously a problem with the HomeGroup feature when previous OS are on the network.
I just spent more time looking around for information and there is some speculation that Windows 7 IPv6 might now be compatible with some routers (which might be the root cause of the proble,). But other than the site I referenced (and now here) this is the only solution to the problem. (which I am posting).
I like having my solutions accepted as well... but you can't honestly say that "It's a DHCP problem" even got me close to the solution, right?
I just spent more time looking around for information and there is some speculation that Windows 7 IPv6 might now be compatible with some routers (which might be the root cause of the proble,). But other than the site I referenced (and now here) this is the only solution to the problem. (which I am posting).
I like having my solutions accepted as well... but you can't honestly say that "It's a DHCP problem" even got me close to the solution, right?
ASKER
Not to mention if someone else looks at this thread, they will not see the actual solution, they will only see your comments, with the correct soltion somewhere lost beneath.
You are correct. I was trying to give a little more clarity.
There may be a question during the final windows 7 installation (on new computers) that triggers this ( I also doubt that it is the default ). Even though the instructions in the URL you listed fixed the problem, it doesn't tell the cause (how it got that way).
Is it possible that a user tried to share the internet with a friend or a smart phone or something - without really knowing what they were doing? Not trying to place blame or anything, just trying to see what could have changed.
Suggestion - try running MalwareBytes on the computer that was the problem. If it turns up something interesting - Please post it.
Thanks!
There may be a question during the final windows 7 installation (on new computers) that triggers this ( I also doubt that it is the default ). Even though the instructions in the URL you listed fixed the problem, it doesn't tell the cause (how it got that way).
Is it possible that a user tried to share the internet with a friend or a smart phone or something - without really knowing what they were doing? Not trying to place blame or anything, just trying to see what could have changed.
Suggestion - try running MalwareBytes on the computer that was the problem. If it turns up something interesting - Please post it.
Thanks!
ASKER
Actually,
It seems this issue has not been resolved as we previously thought. I will post the requested IP info as requested by Jimmy and perhaps he can find the solution (since I have not). This problem should remain open.
It seems this issue has not been resolved as we previously thought. I will post the requested IP info as requested by Jimmy and perhaps he can find the solution (since I have not). This problem should remain open.
After reading your IPconfig output again, I see you are attaching to the internet via wireless. Is it possible that there is a neighboring Wireless router that your computer's are getting their DHCP from?
Another test to try - on one computer that is not working (XP?). Open your wireless configuration utility and note which system you are connected to and also note your own system.
Disconnect from whatever you are connected to, Then remove all sites that are not yours.
Reconnect to your site and test the internet.
If that gives no joy, try turning off all windows 7 computers. Ensure that your XP computer can access the internet. Turn on each windows 7 computer one at a time and when each one is up, go to a command prompt (on the XP machine) and do these:
> ipconfig /release <enter>
> ipconfig /renew <enter>
check your internet connection
When the connection fails, do an IPconfig /all from the XP machine and the from the last Windows 7 machine to be turned on. Please list these.
That should give some good clues.
:-)
Another test to try - on one computer that is not working (XP?). Open your wireless configuration utility and note which system you are connected to and also note your own system.
Disconnect from whatever you are connected to, Then remove all sites that are not yours.
Reconnect to your site and test the internet.
If that gives no joy, try turning off all windows 7 computers. Ensure that your XP computer can access the internet. Turn on each windows 7 computer one at a time and when each one is up, go to a command prompt (on the XP machine) and do these:
> ipconfig /release <enter>
> ipconfig /renew <enter>
check your internet connection
When the connection fails, do an IPconfig /all from the XP machine and the from the last Windows 7 machine to be turned on. Please list these.
That should give some good clues.
:-)
ASKER
NAS was assigned .101 and seemed to be controlling other DHCP functions although they appeared turned off
ASKER