[dns-operations] Strange behavior of google public resolver

Stephane Bortzmeyer bortzmeyer at nic.fr
Thu Apr 18 09:46:06 UTC 2019

On Thu, Apr 18, 2019 at 11:46:28AM +0300,
 Taras Heichenko <tasic at hostmaster.ua> wrote 
 a message of 75 lines which said:

> And sometimes I get answer

Testing with RIPE Atlas probes show that, indeed, all other resolvers
manage to resolve the domain, but often fails (but not always):

% blaeu-resolve -r 100 -q NS --displayvalidation -x rv.ua
[ERROR: SERVFAIL] : 85 occurrences 
[ba1.ns.ua. ns5.dnsmadeeasy.com. ns6.dnsmadeeasy.com. ns7.dnsmadeeasy.com.] : 10 occurrences 
[TIMEOUT] : 1 occurrences 
Test #20841694 done at 2019-04-18T09:37:09Z

I think you'll have to report it to Google. I see no serious problem
in your domain.

(Of course, it would be better to move away from DSA, but it shouldn't
make a SERVFAIL, just a lack of validation.)

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