[Dnsmasq-discuss] weird dnsmasq behaviour

Yves Dorfsman yves at zioup.com
Mon Oct 14 18:32:34 BST 2013


I am having a weird problem with dnsmasq. I'm using version 2.65 that comes 
with Fedora.

I have added a CNAME for www to a domain, in DNS.
Several hours later:

   - dig @8.8.8.8 www.example.com gives me the CNAME as expected
   - dnsmasq, which uses 8.8.8.8 as it's dns server replies nxdomain
   - when I re-start dnsmasq:
     - I get the CNAME as expected in reply to my first query
     - I get NXDOMAIN to all subsequent queries, until I re-start dnsmasq again


dig www.example.com
     Oct 14 11:21:20 via2833 dnsmasq[24679]: query[A] www.example.com from 
127.0.0.1
     Oct 14 11:21:20 via2833 dnsmasq[24679]: cached www.example.com is 
NXDOMAIN-IPv4
empty answer


I re-start dnsmasq:
     Oct 14 11:21:24 via2833 dnsmasq[24679]: read /etc/hosts - 5 addresses

dig www.example.com
     Oct 14 11:21:26 via2833 dnsmasq[24679]: query[A] www.example.com from 
127.0.0.1
     Oct 14 11:21:26 via2833 dnsmasq[24679]: forwarded www.example.com to 8.8.8.8
     Oct 14 11:21:26 via2833 dnsmasq[24679]: reply www.example.com is 
NXDOMAIN-IPv4
Even though the log says "reply is NXDOMAN", I actually get the right answer 
here, the CNAME, as expected.


I run the same comman again, right away:
Oct 14 11:21:28 via2833 dnsmasq[24679]: query[A] www.example.com from 127.0.0.1
Oct 14 11:21:28 via2833 dnsmasq[24679]: cached www.example.com is NXDOMAIN-IPv4
and I get empty answers again, I am getting them until I re-start dnsmasq.

Note that at any point in time "dig @8.8.8.8 www.example.com" gives me the 
right answer.


I really don't understand what is going here...


-- 
Yves.                                                  http://www.SollerS.ca/
                                  Unix/Linux and Python specialist in Calgary.
                                                        http://blog.zioup.org/



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