Bug: nest wifi pro doesn't seem to provide custom IPV6 dns servers to clients

[fjleon]

I am trying to use pihole as a local DNS, and i'm finding out that the nest wifi pro 6e doesn't seem to allow to specify a custom DNS server for ipv6, or rather, if you specify an IPV6 DNS client in the settings, it won't get assigned to computers via DHCP (tested on windows 11).

While you can configure a custom DNS for the router itself, my clients are still getting an automatically obtained DNS (which belongs to the ISP). The only workaround to be able to use my custom DNS server is to configure the DNS manually.

Not sure if this is just a bug (i am using a local link fe80 DNS ip, which works fine when configured manually), or if rather this is just not done at all.

[fjleon]

made a packet capture which confirmed that google is not using dhcpv6 at all, and instead doing router advertisements via icmpv6 type 134 which is setting a recursive dns server and prefix which it is obtaining from the ISP.

how do i get support from google via email? i don't want phone/chat support

[fjleon]

it's documented here: https://support.google.com/googlenest/answer/6361450?hl=en

The router also requests an IPv6 prefix from the ISP, which is used to send the IPv6 router advertisements to the clients on the LAN, to allow them to derive their own addresses.

If the ISP provides a usable prefix, Google Nest Wifi and Google Wifi will start sending IPv6 routing advertisements to clients on the LAN to allow them to pick and validate their own IPv6 addresses using the SLAAC (or “slack”) procedure.

My ISP seems to be providing such as prefix. But the fact that google only seems to support dhcpv6 as a client (i.e to get info from the ISP) and not as a server (to provide info to clients) is a bit disappointing

[virnab]

Hi fjleon,

Thank you for posting in the community.

I understand you're looking to use Pi-hole as a local DNS with your Nest WiFi Pro 6E but encountered some difficulties specifying a DNS server for IPv6. I appreciate that you have done some troubleshooting steps, including testing on Windows 11 and confirming that manually configuring the DNS works. I can definitely help you look into this.

To better assist you, I would appreciate it if you answered the following questions:

• What error does the Google Home app state?
• Does the Internet Service Provider (ISP) allow IPv6?
• Have you ever been able to obtain an IPv6 address?
• Does the device that's attempting to connect with IPv6 support IPv6?
• Is there a router upstream from the parent point?
• Are you trying to use IPv6 on the guest network?

Please keep me posted.

Best regards,

Virna

[fjleon]

• What error does the Google Home app state?
  

Where did I say there's an error?

• Does the Internet Service Provider (ISP) allow IPv6?

You did read that I have this working by manually specifying the ipv6 dns addresses right?

• Have you ever been able to obtain an IPv6 address?

You did read that I am in fact using IPv6 and that this is just me trying to get the DNS automatically assigned by the google router?

• Does the device that's attempting to connect with IPv6 support IPv6?

Oh come on. Please read the topic.

• Is there a router upstream from the parent point?

First decent question. No. From the street the fiber cable goes to the modem, and from the modem to the google wifi.

• Are you trying to use IPv6 on the guest network?

No

Since you clearly did not understand the post, I will explain again. I want the google router to automatically assign the DNS IP i want to my computers, instead of google assigning me the one from my ISP. While I can configure the DNS in the google home app, google does not use it to advertise the DNS to the computers. Google doesn't seem to support dhcpv6. Instead, it is sending a router advertisement via slaac with the ipv6 prefix and DNS that the ISP sends me