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Changed LAN ip address after powerdown/reboot

ronkna
Community Member

Situation:  Router from my ISP in bridge mode, so basically a modem, connected by wire on a  Nest Wifi  with 4 AP's troughout the house. 

Sometimes when the connection gets interrupted, i.e. after my ISP did some maintenance on the network of after a powerdown/reboot of my modem, the (static) LAN ip address of the Nest router changes to one subnet higher. so, from  192.168.178.1 to 192.168.179.1. In a few occasions it did happen all of a sudden in the middle of the day. 

Why does this happen and more importantly, how can I prevent this? Because I have to manually change the ipaddress back to its original in order to let everything connect to the internet again. I have a Raspberry Pi in my network with PiHole. I only use the DNS option in PiHole and nothing else.

10 REPLIES 10

olavrb
Platinum Product Expert
Platinum Product Expert

That's a question for your ISP, I'd say.

Given the IP address, it could indicate that your modem is not in bridge mode?

Nest Wifi should be able to be set to DHCP mode on its' WAN port and by that autodetect changes to the WAN IP it gets, but in my experience it can be slow to detect changes.


I don't work for Google.

ronkna
Community Member

Uhm... 

I think you somehow misread my post even though it should be quite clear.  I'm talking about my LAN (Local Area Network) ipaddress on my Nest Router that changes. Not the WAN (Wide Area Network) ... Even the IP address 192.168.178.1 should ring a bell since this is a private ip address... 

So, now knowing this piece of information, any idea's?

olavrb
Platinum Product Expert
Platinum Product Expert

Nest Wifi does not choose that subnet adress by default, but 196.168.86.0/24 for primary network, and 192.168.87.0/24 for guest network. Which is what got me thinking the adresses you wrote about is what Nest Wifi is getting fed to its' WAN port.

Did you set subnet address yourself? Nest Wifi choosing a non standrad ip address range for LAN indicates there might be some IP conflicts. Do you have multiple routers and/ or DHCP servers in your network? Do you use the Pi-Hole as DHCP maybe? In addition to Nest Wifi? (Yes, I read that you are using Pi-Hole only for DNS).

Related threads:

Could be helpful to know how you've connected it all up. From the internet outlet in your place, all the way to the clients. Modem, cables, switches, routers, Pi-Hole, more?


I don't work for Google.

ronkna
Community Member

I did set the subnet myself because of some devices that have ip address reservations and I did want to change them. I have used the PiHole for DHCP but disabled it because of this. How i got PiHole DHCP configured was as follows: Nest wifi: an address pool with 1 ip address which I assigned to an always connected device (smart plug). On the PiHiole I created a pool which didn't include that 1 ipaddress. But as I mentioned above, I disabled that configuration (and the DHCP on the PiHole) completely

But it got my thinking.. When I installed Google WiFi in my home, I contacted my ISP to put my modem/router in bridge mode. I once did setup that modem/router to be DHCP server in that same range. So whatif... Upon reboot of that modem/router due to power failure or whatever, the OLD config boots up, so the DHCP server is enabled before the bridge config kicks in, but just long enough to interfere with the Nest router, which then acts by jumping one subnet higher.

I guess there is no other option than to change the subnet to something completely different and see what happens.... 


ronkna
Community Member

Oh and btw.. Is there an API for Google WiFi/nest routers or accesspoints?

I want to have more statistics about the network and traffic (like errormessages or something in case of an IP address conflict😁) Or even change settings like priority without having to grab my phone every time, because the app.. well, isn't the best way to config a router. Why not having a descent website to config or whatever...

olavrb
Platinum Product Expert
Platinum Product Expert

There are no official alternatives to the Home app for management.

There are a webpage to see status:

More discovered endpoints here:

There are also this project:

Edit, found this too:


I don't work for Google.

Jeff
Community Specialist
Community Specialist

Hi, ronkna.
I just wanted to jump in real fast to see if you saw olavrb's latest reply and to see if you still needed some help on this or if you were able to get it sorted out. If you are still needing some help, just let us know and we'll be happy to continue helping.
Thanks.

ronkna
Community Member

Hi Jeff,

I've upvoted his reply so I did see it 😉 

To give you (and everyone else) an update, after I had changed the LAN IP address on the Nest Router to something completely different, I haven't had any problems with it. So my guess is that a modem in bridge mode is after reboot (very) briefly still a router with a DHCP server which seems to be causing the issue.

As far olavrb's reaction to my question on API's, I knew most of them and none of them are actually really useful. Such a pity that a company like Google makes is this hard to customize their products except for their android phones

Jeff
Community Specialist
Community Specialist

Hey, ronkna.

Thanks for following up.

I understand what you're saying with the customization. That's actually a suggestion I can pass along to our teams. They're always looking for feedback from our community. I'll make sure your comments are seen.

Thanks.

Jeff
Community Specialist
Community Specialist

Hi, all.
As we got our resolution here, I'm going to mark this one as resolved. Thanks to all who helped and contributed. If anyone has any other needs, please feel free to open up a new thread.
Thanks!