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Cloudflare public DNS broken w/ AT&T CPE

I am behind a Calix router at home for my ISP and goes to my router
and not any further. When I enter the IP into my browser, it opens the
login page for my router. So it appears is used as a loopback in my
Calix router. goes to the proper place fine.

On Sun, Apr 1, 2018 at 3:59 PM, Jeremy L. Gaddis <lists-nanog at gadd.is>

> Greetings,
> If anyone at 7018 wants to pass a message along to the correct folks,
> please let them know that Cloudflare's new public DNS service (
> is completely unusable for at least some of AT&T's customers.
> There is apparently a bug with some CPE (including the 5268AC). From
> behind such CPE, the services at are completely unreachable,
> whether via (ICMP) ping, DNS, or HTTPS.
> Using the 5268AC's web-based diagnostic tools, pinging returns
> the following results:
>   ping successful: icmp seq:0, time=2.364 ms
>   ping successful: icmp seq:1, time=1.085 ms
>   ping successful: icmp seq:2, time=1.160 ms
>   ping successful: icmp seq:3, time=1.245 ms
>   ping successful: icmp seq:4, time=0.739 ms
> RTTs to the CPE's default gateway are, at minimum, ~20 ms.
> A traceroute (using the same web-based diagnostic tool built-in to the
> CPE) reports, simply:
>   traceroute with: 64 bytes of data
>   1:, time=0 ms
> I haven't bothered to report this to AT&T through the standard customer
> support channels (for reasons that should be obvious to anyone who has
> ever called AT&T's consumer/residential technical support) but if anyone
> at AT&T wants to pass the info along to the appropriate group, it would
> certainly be appreciated.
> Thanks,
> -Jeremy
> --
> Jeremy L. Gaddis
> "The total budget at all receivers for solving senders' problems is
> $0. If you want them to accept your mail and manage it the way you
> want, send it the way the spec says to."  --John Levine

Darin Steffl
Minnesota WiFi
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