[dns-operations] weird DNS problem

Mark Andrews marka at isc.org
Thu Jun 27 05:13:54 UTC 2013

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	Database last updated on 27-Jun-2013 00:27:16 EDT.


In message <CAEPLxq_y-s9UN8VXZZT_mjbDCuSueO-HZD==NSYKwVuUJR-=TQ at mail.gmail.com>
, alex flores writes:
> Hi there
>  This is Alejandro Flores from Mexis, an ISP in Mexico city
>  We are having some weirs issues we would like to share with the list,
> looking for some help or comment
>  We have 2 authoritative DNS and
> (ns1.infoacces.net and ns2.infoacces.net)
>  In the last 2 weeks we have been receiving some users reports about
>     problems to have email delivered from our mail server to external
>     email servers (and from external servers to our server).
>  As usual we verify the logs and we started to see problems related
>     with reverse, however our reverse are correct, so we checked the
>     DNS used by the remote provider, the result is that their dns is
>     unable to reach our DNS
>  We check any firewall policy that could be blocking the request but
>     thats not the case.
>  We checked our DNS, but these hasnt been changed in a long time
>  Again, using an external affected DNS we enable the debug, and we
>     noticed that the DNS was unable to get the TLD Servers  from the
>     root servers, Thats a theory about the possible reason to the situation.
> One more weird thing is that just as the problem appeared, just
> dissapeared from the dns affected
> and it start to work correctly, but now we received the report from
> another dns....
> So it looks like the condition that block the dns communication
> dissapear and then apply to another dns.
> In this moment for example aol.com is affected, if i try to send me an
> email from aol the bounce error is

> ----- The delivery status notification errors -----
> <alejandro.flores at mexis.net>: Host or domain name not found. Name service err
> or
>     for name=mexis.net type=MX: Host not found, try again
> But if i use gmail or any other email service it works.
> Any tip or idea to solve this situation?
> The dns logs just dont show anything, cause the dns request never
> reach the dns, in fact is the user in a server affected query our dns
> he receive the correct response, so maybe the problem could be that
> the dns query is unable to get the authoritative dns... may be.
> Thanks for any comment
> Alejandro Flores L.
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org

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