[outages] Comcast public-facing DNS servers unreachable

[Jeremy Chadwick]

Thanks Paul!  I chose my words poorly.  I should have said authoritative
NSes.

This affects comcast.com, xfinity.com, and xfinity.net as well as
comcast.net as I originally reported.  Unsure of any other domains.

-- 
| Jeremy Chadwick                              jdc_at_koitsu.org |
| UNIX Systems Administrator                      PGP 0x2A389531 |
| Making life hard for others since 1977.                        |

On Thu, Mar 30, 2023 at 10:14:44PM -0600, Paul Ebersman via Outages wrote:
> outages> Looks like Comcast's public-facing DNS servers aren't
> outages> responsive.
> [...]
> outages> comcast.net.            172800  IN      NS      dns101.comcast.net.
> outages> comcast.net.            172800  IN      NS      dns102.comcast.net.
> outages> comcast.net.            172800  IN      NS      dns103.comcast.net.
> outages> comcast.net.            172800  IN      NS      dns104.comcast.net.
> outages> comcast.net.            172800  IN      NS      dns105.comcast.net.
> 
> These are their auth servers, including for comcast.net. Confirmed the
> IPs for them are pingable but they time out for any DNS query.
> 
> The comcast recursive servers at 75.75.75.75 are still working but
> SERVFAIL for queries that ask dns10x.comcast.net.
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