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

[Mark Andrews]

In message <alpine.LSU.2.00.1101191603010.3329 at hermes-1.csi.cam.ac.uk>, Tony Finch writes:
> On Wed, 19 Jan 2011, Joe Abley wrote:
> > On 2011-01-19, at 09:38, Mark Andrews wrote:
> >
> > > 99.999% of AAAA lookups work fine.
> >
> > Are there public test results that confirm this?
> 
> 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?
 
> This probably doesn't correspond very well to the query pattern on a
> normal recursive DNS server. Also I did not count other failure modes such
> as returning NXDOMAIN when the domain name has A records but not AAAA.
> 
> 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.
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org