Strange BIND 9.4.1-P1 problem

Tony Earnshaw tonni at
Tue Aug 14 02:08:57 UTC 2007

Mark Andrews skrev, on 14-08-2007 02:28:

>> [...]
>>> 	Upgrade now.
>>> 	When a fix is is available you will need to upgrade again.
>>> 	I do have a question for you. 
>>> 	Does this resolver have DNS validation enabled?
>> How does a resolver do DNS validation? The MTA (Postfix latest stable) 
>> on all the sites I administer does DNS validation for each message it 
>> receives, and if an address isn't valid it gives an smtp 450 - till the 
>> sending MTA gives up in the end - or adapts. But how does a resolver do 
>> DNS validation?
> 	Named has a resolver built into it.  It also has a server built into
> 	it.  Let me rephrase the question.
> 	Does named have DNS validation enabled?

This is a new one on me. I've looked through the admin doc and grep 
-i'ed in the doc arm directory and all I can find is DNSsec validation, 
which I can understand. Nor does Google turn anything up about any DNS 
validation that I didn't know already.

What's meant by "DNS validation" in this context?


Tony Earnshaw
Email: tonni at hetnet dot nl

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