qmail issue
Mark Andrews
Mark_Andrews at isc.org
Tue Apr 26 06:29:45 UTC 2005
> Mark Andrews wrote:
> >>>>A "deferral: CNAME_lookup_failed_temporarily._(#4.4.3)" log entry has
> >>>>been created, when the sender
> >>>>is using qmail to send us an email.
> >>>>
> >>>>Here is some interesting link found by google:
> >>>>http://www.faqts.com/knowledge_base/view.phtml/aid/28942
> >>>>http://www.cyber-sentry.com/index.php?id=58
> >>>>
> >>>>
> >>>I think this problem is a qmail problem. I am not a qmail guy... sorry...
> >>>
> >>>
> >>Yes, it is a qmail "feature", but if could decrease my repsonses less
> >>than 500 byte this "feature" will not be problem anymore.
> >>
> >>Best wishes,
> >>Andras
> >>
> >>
> >>
> >>>dave...
> >>>
> >>>
> >>>
> >
> > Do you have a firewall sitting in front of the nameserver
> > that is performing statefull inspection of DNS queries?
> >
> How could I test the UDP responses by myself? Should I capture and
> analyze the all traffic or could I find
> a special tool? How could I make the "ANY" query (if "any" means a
> special type of query)?
> Any FAQ or doc are welcome.:)
You need to find some remote site to check from
dig any gsb.ceu.hu @ns.ceu.hu (UDP)
dig any gsb.ceu.hu @ns.ceu.hu +vc (TCP)
> > The reason I ask this is that the server is not responding
> > to DNS/UDP ANY queries for the two domains but does respond
> > to DNS/TCP ANY queries and there are firewalls that are
> > known to examine DNS/UDP but not examine DNS/TCP.
> >
> > Note neither response to the ANY queries would exceed 512 bytes.
> >
> > Mark
> >--
> >Mark Andrews, ISC
> >1 Seymour St., Dundas Valley, NSW 2117, Australia
> >PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
> >
> >
> >
> >
> >
>
>
> --
> DORN András -- dorn at ktk.bme.hu
> Budapesti Mu"szaki és Gazdaságtudományi Egyetem
> --
> András DORN -- dorn at ktk.bme.hu
> Budapest University of Technology and Economics
> -----------------------------------------------
>
>
>
>
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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