[Dnsmasq-discuss] Odd DNS behaviour for www.freesat.co.uk
pm at nowster.org.uk
Mon Feb 17 22:43:17 GMT 2020
On Mon, Feb 17, 2020 at 09:05:34PM +0000, Simon Kelley wrote:
> It's pretty difficult to see what dnsmasq can do here, other than give
> up on caching such negative data.
> A reply _from_a_recursive_server_ which includes a CNAME, but no data
> for the target of the CNAME, contains the implication that the target
> doesn't exist.
> Apart from the zone admins, I think the other responsible parties here
> may be the recursive server you are using, (cloudflare at 220.127.116.11) By
> returning the data they are, they cause the problem.
> Testing here, I see different answers to the query www.freesat.co.uk at
> 1) SERVEFAIL
> 2) The four A records
> 3) A complete CNAME, including the A record for ghs.googlehosted.com.
> 4) Both 2 and 3 combined.
> I've not observed the incomplete CNAME that you saw, so maybe this has
> been fixed by Cloudflare?
I was seeing this problem earlier (and last week) with several
recursive DNS servers, not just Cloudflare, including Google and
several ISP DNS servers.
A few hours later I can't reproduce it!
It looks like something had been broken and may be in the process of
Thanks for looking.
Paul Martin <pm at nowster.org.uk>
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