Re: question about multiple queries in a single dns packet

2010-12-29 Thread Alan Clegg
On 12/29/2010 2:17 PM, Federico Barbieri wrote:
 Not sure if this is the right place to ask but I've been trying to dig
 around and found nothing...
 
 reading the dns specification it would seems possible to send multiple
 request in a single packet.

I'm not sure what the actual reference is, but don't do that.

Nobody supports it (what would the answer section contain?  what does
the RCODE actually mean?)...

AlanC



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Re: question about multiple queries in a single dns packet

2010-12-29 Thread Michael Sinatra

On 12/29/10 14:06, Alan Clegg wrote:

On 12/29/2010 2:17 PM, Federico Barbieri wrote:

Not sure if this is the right place to ask but I've been trying to dig
around and found nothing...

reading the dns specification it would seems possible to send multiple
request in a single packet.


I'm not sure what the actual reference is, but don't do that.

Nobody supports it (what would the answer section contain?  what does
the RCODE actually mean?)...


I believe it's in the EDNS1 specification that Paul did a while back, 
after EDNS0.  I don't think it ever got advanced to RFC:


http://tools.ietf.org/html/draft-ietf-dnsext-edns1-03

See especially section 4.

The answer to your question on RCODE:


4.2. RCODE and AA apply to all RRs in the answer section having the

   QNAME that is shared by all questions in the question section.  AA
   applies to all matching answers, and will not be set unless the exact
   original request was processed by an authoritative server and the
   response forwarded in its entirety.

michael
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