Same Transaction ID queries

[Samer Khattab]

What is BIND internal logic when such a series of queries are received, and
why it would not answer to all requests.

Regards,
Samer Khattab


On Sun, Feb 5, 2012 at 9:42 AM, Mark Andrews <marka at isc.org> wrote:

>
> In message <CAH14rHi==V=BG4AZUGTuO0m7ruQC+WiK3hRko=
> Oky1LEpDf0mA at mail.gmail.com>
> , Samer Khattab writes:
> > Hi all,
> >
> > We have an observation for some queries where BIND caching server
> receives
> > multiple queries (three or four,  A or AAAA) for a domain name, with the
> > same transaction ID in the DNS header in all query packets, and one
> > response packet is sent back from the server only for these queries.
> >
> > The client IP,source port and Server IP is the same in these queries.
> >
> > Is this the right BIND behavior in this case or it is an issue.
>
> It is expected behavior.
>
> > Regards,
> > Samer Khattab
> --
> 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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