[dns-operations] Oddness with Cloudfare authoritative servers
warren at kumari.net
Wed Sep 22 23:49:05 UTC 2021
On Wed, Sep 22, 2021 at 7:26 PM Adam David <adam.vallee at gmail.com> wrote:
> This does not seem to be a DNS resolution/misconfiguration issue on
> Cloudflare's end.
> https://18.104.22.168/ provides an error message (as it should) indicating
> it is a CloudFlare IP. If you can't see that in a web browser, then the
> issue is local to your network.
Yes, 22.214.171.124 is a CF address, but it was being returned for
Doing a GET / over TLS with the host set to deltamath.com was giving a 403
HTTP/1.1 403 Forbidden
Date: Wed, 22 Sep 2021 18:44:15 GMT
The other address handed out all worked fine.
1: it is a DNS issue and they shouldn’t have handed out that address for
that name or
2: that machine was borked.
> The main causes that I gather would be:
> 1. There was a temporary cache propagation issue on CF's network. (Still
> not a DNS issue.)
> 2. Your IT department is using 126.96.36.199/9 or possibly even 188.8.131.52/8
> where they intended to use 172.16.0.0/12 (RFC1918 IP space). This would
> block access to the netblock belonging to Cloudflare and you would have
> difficulty accessing thousands of websites.
> Side Note: 184.108.40.206/13 belongs
> to AS13335.
> You should always start with your IT department.
> If you are a Cloudflare customer, contact them directly.
> If you are a DeltaMath customer, then you need to contact them directly.
> Adam Vallee
> On Wed, Sep 22, 2021 at 4:03 PM Brown, William <wbrown at e1b.org> wrote:
>> From: dns-operations <dns-operations-bounces at dns-oarc.net> On Behalf Of
>> Erik Stian Tefre
>> Sent: Wednesday, September 22, 2021 3:38 PM
>> To: dns-operations at lists.dns-oarc.net
>> Subject: Re: [dns-operations] Oddness with Cloudfare authoritative servers
>> > Possibly not a DNS issue at all, but something like this:
>> > https://community.cloudflare.com/t/revil-ransomware/301435
>> > (Executive summary: One Cloudflare IP being blocked by a firewall
>> because of a different and misbehaving Cloudflare customer who happened to
>> serve malicious content from that same IP.)
>> > Regards,
>> > Erik
>> Interesting. The real issue I am experiencing is that I am getting
>> inconsistent responses from nominally the same authoritative server. It
>> just so happens that when we get 220.127.116.11 as the answer it fails. I
>> would prefer to get the correct answer so students can use the online
>> educational resource the district is paying for.
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Perhaps they really do strive for incomprehensibility in their specs.
After all, when the liturgy was in Latin, the laity knew their place.
-- Michael Padlipsky
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