Cloudflare 1.1.1.1 public DNS broken w/ AT&T CPE

Darin Steffl darin.steffl at mnwifi.com
Mon Apr 2 15:03:14 UTC 2018


I am behind a Calix router at home for my ISP and 1.1.1.1 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 1.1.1.1 is used as a loopback in my
Calix router.

1.0.0.1 goes to the proper place fine.

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

> 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 (1.1.1.1)
> 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 1.1.1.1 are completely unreachable,
> whether via (ICMP) ping, DNS, or HTTPS.
>
> Using the 5268AC's web-based diagnostic tools, pinging 1.1.1.1 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 1.1.1.1 with: 64 bytes of data
>
>   1: 1.1.1.1(1dot1dot1dot1.cloudflare-dns.com), 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
www.mnwifi.com
507-634-WiFi
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