[dns-operations] Google DNS overriding TTL settings?
regnauld at nsrc.org
Wed Sep 12 21:09:01 UTC 2012
Chris Boyd (cboyd) writes:
> Anyone else seeing this? Or is it common knowledge I just tripped over?
You're looking at different RRsets. Google has a cached pair of CNAME
and A records:
> www.ionadas.com. 9759 IN CNAME ionadas.com.
> ionadas.com. 9759 IN A 184.108.40.206
While the authoritative server for ionadas.com (ns1.midasnetworks.com)
> www.ionadas.com. 3600 IN A 220.127.116.11
So I suspect ionadas.com was simply changing from (CNAME -> A) to
an explicit A record for www.ionadas.com, and you happened to query
at the right moment.
The instance of 18.104.22.168 I'm querying is returning the single A record.
Would have been interesting to compare SOAs as reported by Google and
the authoritative servers, respectively, to compare serials.
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