qmail issue

[Mark Andrews]

> 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