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PCGalOfCal

Netgear router keeps changing LAN ip address
Hi all,
I have a Netgear router that is connected to a Modem.  DHCP is enabled.  Originally, the ip address of the router was 192.168.1.1.  Recently, about once a week, the router keeps saying there is an ip conflict with the ISP's ip address and therefore, the router then changes it's ip of 192.168.1.1 to 10.0.0.1.  What I don't understand is when I go into the router and look at the WAN ip, it's not 192.168.1.1.  Not very close.  Anyone know how I can turn this off so the router doesn't change it's ip address.  Normally I wouldn't care but there is a large Konica printer\scanner that has already been configured on the 19.168.1.1 network and I'd rather not have to figure out how to change all those settings.  Thank You.

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Avatar of PCGalOfCalPCGalOfCal

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I must not of explained it correctly.  The Router's Wan interface does receive via DHCP.  They do NOT have a WAN static ip.   When I look in the router, the WAN (or internet port ip settings) is 75.4.228.151.  The LAN port is address 192.168.1.1.  The printers static ip address is 192.168.1.99.  I see no conflicts here and therefore I don't understand why the router keeps changing the LAN port from 192.168.1.1 to 10.0.0.1.  

Does that change any of your recommendations?

Thank You.

Thanks that does clarify a bit more.  Is the router assigning DHCP addresses to devices on the LAN side?  If so, what is the range available to be assigned?

Strange that it would choose 10.x.x.x. as these routers usually default (from the manufacturer) to a 192.168.x.x address.  Have you tried resetting the device back to factory defaults and then seeing how it behaves?  You should be able to back up the config (save config) to a TFTP server before you do this (but I would manually set it up again and not rely on the reloading the config).

DHCP starting ip is 192.168.1.2.  Ending ip for DHCP is 192.168.1.50
One pc on the network has a static ip of 192.168.150
One network printer has static ip of 192.168.1.99
HOWEVER, four weeks ago when this problem started I looked for a firmware update to the router and there was not one.  I just looked again and guess what?  There was one.  HMMMM,
thats the only thing that makes sense.  Would you agree?

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Avatar of RGRodgersRGRodgers🇺🇸

It certainly could be a firmware bug.  However, you should check the release notes of the new firmware to see if this is a known problem.

On the other hand, is this a wireless router?  It could be that someone is jumping on it with a conflicting address in that case.  

...RG

A firmware issue could certainly cause this but I would expect there to be something on the internet (google, etc) or in the release notes as mentioned by RGRodgers.

Some routers will offer a log section to review.  You might find something there showing what is happening.  The only problem is that these are usually first in, first out and might clear on a reset.  I'd check it though.  It might show you a MAC Address of something that is conflicting.

Ok, thank you.  So far, after doing the firmware upgrade it has not happened again.  I will wait a little while longer to see if it happens again.  If it does not happen one week from today, I will close this post.  Thanks again.

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The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.