Device shows wrong IP address in port management

[srochford]

I've just connected a new PC to my network. Initially, it got the address 192.168.1.107 from DHCP but I wanted it to have a fixed address so I reserved .1.10 for it and the PC now has that address.

If I go into port management, I can see the PC with the right host name and MAC address but with the old .1.107 IP.

If I try to set up port forwarding it doesn't work - presumably because it's trying to forward to a non-existing IP.

I've tried restarting the router and I've waited more than 24 hours but it still shows the wrong address 

Any suggestions?

Steve

[Dan_A]

Hi srochford,

Thanks for posting.

Which Google/Nest router are we working with? Are you using a modem/router combo from your Internet service provider (ISP)?

You can try the troubleshooting steps below:

• Important: The steps you will take may or may not work and will also depend on the device that you have. These are steps that you may follow by word if your computer has the same interface as below.

We may be able to take this home if the concern is about caching issues on your modem/router:

1. Flush the router's DNS cache:

• Access your modem/router's web interface.
• Look for a section related to DHCP or LAN.
• Search for an option to flush the DNS cache. This might be labeled as Clear DNS or Release and Renew DHCP leases.
• Click the button to flush the cache and wait for the process to complete.
• Restart your PC and check again if the port management shows the correct IP address.

2. Release and renew the PC's IP address:

• Open a command prompt on your PC as administrator.
• Type the following command and press Enter:

ipconfig /release

• Wait for the command to finish.
• Then, type the following command and press Enter:

ipconfig /renew

• This will release the current IP address and request a new one from the DHCP server.
• Check if the port management now shows the correct IP address for your PC.

3. Manually add the PC's IP address and MAC address to the router's DHCP reservation table:

• Access your router's web interface.
• Look for a section related to DHCP or LAN.
• Locate the DHCP reservation table or static IP assignment section.
• Enter your PC's MAC address, IP address (.1.10), and hostname if desired.
• Save the changes and restart both your router and PC.

On the other hand, if we understood you correctly, you may need a static IP on this one, and your ISP can provide you with the settings that you want and the steps to take.Could you reach out to them for more information? Let us know how it goes.

Best,

Dan

[srochford]

Many thanks for this.

I'm using the basic Google Nest WiFi router.  I'm using it as a router with the ISP device just providing modem services so all of the DHCP/DNS is provided by the Nest device, not the ISP device.

There doesn't appear to be any option in the Google home app to flush the DNS cache and there's also no option to release/renew DHCP addresses. I have done ipconfig /release and /renew on the computer; it has the IP address allocated by DHCP but the port forwarding section still shows the wrong IP.

I have used the Google Home app to reserve the IP I want for my PC in the DHCP settings and that works - the PC gets the new IP but the ports section still does not update.

Steve

[Dan_A]

Hey there,

We appreciate all your efforts. We'd like to take a deeper look into this for you. Please fill out this form with all the needed information, and then let us know once you're done.

Regards,

Dan

[Dan_A]

Hey srochford,

We haven't received your form. Have you had a chance to fill it out?

Thanks,

Dan

[Dan_A]

Hello again,

We got your form — thanks for filling it out. Our team will reach out to you via email anytime soon. Please continue the conversation there for updates.

Cheers,

Dan