XR1000 connecting to ISP's IPV6 DNS even tho configured for Cloudflare.

[SimMAUDeon]

I have my IPV6 DNS servers set to Cloudflare, but the system log shows that the router is connecting to my local ISP (Comcast).

I've disabled and re-enabled IPV6 and rebooted the router several times, but it's still connecting to Comcast IPV6 DNS.

Ideas..?

[Netduma Fraser]

Hey, welcome to the forum!

Depending on how you've setup the ISP modem it will be overwriting the DNS you have set here, so you could put the modem in bridge/modem mode for example then it would work or you could enter the Cloudflare DNS on the ISP modem as well.

[SimMAUDeon]

On 5/28/2023 at 4:50 AM, Netduma Fraser said:

Hey, welcome to the forum!

Depending on how you've setup the ISP modem it will be overwriting the DNS you have set here, so you could put the modem in bridge/modem mode for example then it would work or you could enter the Cloudflare DNS on the ISP modem as well.

The modem is a HGD310 and has no configuration. 

Besides that, the modem is upstream of the XR1000 and so it's settings wouldn't be reflected in the logs of the XR1000. 

[Netduma Fraser]

Have you got IPv6 enabled for LAN as well? If not set that and see if it then works please

[SimMAUDeon]

On 5/29/2023 at 10:42 AM, Netduma Fraser said:

Have you got IPv6 enabled for LAN as well? If not set that and see if it then works please

Yes indeed...although that would not be a factor in whether or not the XR1000's dnsmasq connects to a nameserver not specified by a savvy user who chooses to bypass this ISP via router config.  I also used PRTG Network Monitor and verified that none of the devices on my are trying to reach my ISP's DNS server.

I had an idea, but I haven't been table to find solid info/instructions that match - even roughly - the config options on the XR1000.  Several sites say one can prevent all requests to "other" nameservers:53 by setting up your preferred in the router and then configuring the router to (force) redirect all outbound DNS traffic to the preferred.  Some sites say this is "Port Forwarding", which - as far as I can tell from the XR1000's GUI - applies to INbound connections.  Some say this is "TCP/IP Routing", which I haven't had time to properly research.

 

Thoughts..?

[AZX]

I also have xfinity, the xr1000 and use Cloudflare dns servers with the same exact outcome. I always had ipv6 issues with this router.