[dns-operations] To A or to AAAA - was Re: Signaling client

[bert hubert]

Some additional numbers, the top-25000 domains from Alexa, each queried
twice, once AAAA for 'www.domain' and once for the bare domain:

Sending                                 Receiving                          
  Queued                      50000       Received                    49990
  Error -/-                       0       Timeouts                       10
                                          Unexpected                      0
 Sent                         50000      Total                        50000

DNS Status                                                                 
  OK                            618                                        
  Error                         426                                        
  No Data                     48454                                        
  NXDOMAIN                      492                                        
  Unknowns                        0                                        
Answers                       49990                                        
  Timeouts                       10                                        
Total                         50000                                        

The same for A:

Sending                                 Receiving                          
  Queued                      50000       Received                    49999
  Error -/-                       0       Timeouts                        1
                                          Unexpected                      0
 Sent                         50000      Total                        50000

DNS Status                                                                 
  OK                          48173                                        
  Error                         300                                        
  No Data                      1041                                        
  NXDOMAIN                      485                                        
  Unknowns                        0                                        
Answers                       49999                                        
  Timeouts                        1                                        
Total                         50000                                        

"Error" in this context means the PowerDNS Recursor answered with a
SERVFAIL.  It does not imply anything about what the authoritative server
said.

	Bert

On Thu, Jan 20, 2011 at 11:13:02AM +0000, Tony Finch wrote:
> On Thu, 20 Jan 2011, Mark Andrews wrote:
> > In message <alpine.LSU.2.00.1101191603010.3329 at hermes-1.csi.cam.ac.uk>, Tony Finch writes:
> > >
> > > I just took a sample of 10000 different domain names from my mail server
> > > logs. 0.8% of the AAAA lookups returned SERVFAIL or timed out. If I don't
> > > uniquify the domain names I get a failure rate of 0.5%.
> >
> > And how many of those also failed for A?
> 
> for the uniquified list of 10,000 different domains the failure rate for A
> lookups was 0.4%, and for non-uniquified list it was 0.3%.
> 
> Tony.
> -- 
> f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
> HUMBER THAMES DOVER WIGHT PORTLAND: NORTH BACKING WEST OR NORTHWEST, 5 TO 7,
> DECREASING 4 OR 5, OCCASIONALLY 6 LATER IN HUMBER AND THAMES. MODERATE OR
> ROUGH. RAIN THEN FAIR. GOOD.
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