IP Address Conflict

This just cropped up. My notebook has been connected to my network through Linksys WRT54G - until and hour or so ago. The message I get on the taskbar is:"unidentified network no network access". Both my netbook and my girls notebook are connected - no problems. For a brief period of time I finally was able to get connected. Then, a message popped up on the desktop and the notebook about the same time. The title is "Network Error: Windows has detected an IP address conflict" And..."Another computer on this network has the same IP adress as this computer". Well, this is a first. How did they end up with the same IP address?

Any help in resolving this conflict would be greatly appreciated.

 

Is your network set up in a standard configuration, so that your computers automatically get their IP from the router via DHCP?

 

No. The router is set at PPPoE. That's the way it has been. My DSL provider is Verizon. I'm pretty sure that is what they suggested.

 

Look at the IP address of both computers and see what they are. Also check to see if someone else is connected to your network. You are running WPA security?

 

The primary Auto IP Addresses are distinctly different. The physical addresses are (of course) different.

I am running WPA security.

Thanks.

 

Look through the DHCP log it will tell you which IP and MAC address of the error.

Unless your running a static IP duplicate IP's are hard to get. The only time I have seen it when too many devices trying to connect to the device. and/or if the device is not releasing the IP. A easy fix is expanding the DHCP range, and shorten the lease time.

 

To repair duplicate IP addresses on your network follow the steps below

1. Turn off everything on the network, ALL the computers and any other network device like network printers Gaming/ipod devices.
2. Turn off the router and modem.
3. Turn on the modem, wait for a steady Online/Internet light.
4. Turn on the router, wait two minutes.
5. Turn on the network devices and computers, one at a time.


This issue is usually caused by resetting a router without resetting all the network connected devices.

Hope that this is able to help you, good luck.

 

I tried what you suggested but the problem persists. I went one step further and reset the router. The problem is isolated to this one Dell Studio 1555 Notebook. Everything else on the network is connected. When I examine my wireless network connections on the Dell, it is picking up 10 or more signals in the vicinity. It 'sees' my router. It reports that the signal strength is excellent and recognizes the unique SSID that I made up. However, it still reports "Limited Access".

Dunno if any of this background info is relevant...I replaced the HDD in the Dell last week. The old one was crapping out. I created a ghost partition on an external HD and successfully brought it over to the new HDD. I know for sure that I was getting an internet connection through the network up until yesterday.

I'm running under Win7. I ran a Windows Network Diagnostic test. It reports that the 'Wireless Network Connection doesn't have a valid IP configuration'.

Man, this is a new one on me. Thanks for any help you can provide.




Hope that this is able to help you, good luck.[/QUOTE]

 

Are you running Vista on that Dell, and if so, is your network identified as a "public" or as a "private" network?

 

You need to look a the routers logs for the MAC address/IP with confict. You know which NB it is, so take a look under the advanced settings for the wireless device. For most there is a place where you can change the MAC address of the device. If it has been changed clear it out and it should then connect using the original MAC ID.

 

I'll get back. Right about now, I'm pulling my hair out. When I attempt to access my router (192.168.1.1) it won't accept my user name or password) (Username and password associated with Verizon account.) Before I re-set my router yet again...I'm going to attempt to access my Verizon account and see what's up. That has always seemed to be an adventure as well. It must look like I'm a dumb A..h here.... Thanks.

 

Okay. I not sure exactly what I'm doing but for what it's worth here is what I attempted to do. In the router settings I went to Access Restrictions. Next to status, I checked 'Enable'. I left Policy Name blank since I have no clue what to enter. I clicked on 'Edit List of PC's. I copied the Physical Address form the Notebook (is this the MAC addr.?) I entered this address which I'm only guessing is the Physical Address that I found when I went into the Notebook and arrived at the Network Connection Details. There are six series of numbers set in groups of 2 with a hyphen separating all the groups. It seems to fit nicely in the window that I have open where it says: :Enter MAC Address of the PCs in this format" I clicked 'Save Settings". I'm stuck. I don't know what else to do. Under Network Connection Details (Notebook), the Description is for an Intel WiFi Link 5300 AGN. I can see the Auto configuration IPv4 Address.

Regarding the Linksys log:
There is nothing in the Incoming Log Table. I don't see any address in the Outgoing log table that resembles the physical adr. in the notebook.
If I'm missing a step - or missed completely....Please inform. Thanks. BTW, the Notebook is running under Win7 Home Premium.

 

Logging may not be turned on, on the router. Normally if there is a log it's where the lan/wan setup section is at. Router logs looks like this:

How may pc do you have connected to your network? And remember some router can have a seperate DHCP range than wired. If only one range wired and wireless both pull from the pool.

On the router what DHCP range are you using? Normally there is a starting and ending IP address.

Now the pc not connecting may not be the problem child. Another pc is on first and takes the IP address. May want to do a shut down, reboot and launch the one not going on line first to fine the other one with the same MAC/IP address.

 

'All is well that ends well'. I'm still trying to figure out what I did... Anyway, I am connected. I believe that I changed a configuration in the Dell Notebook because the next thing I knew, I got connected. After all of this hullabaloo, everyone that helped deserves a better explanation than this. Let me try to go back tomorrow and see if I can track back to what it was that I did.

Thanks.