[dns-operations] On server selection algorithms in dns resolvers

[Mark Andrews]

In message <22100.47646.491861.300197 at tale.kendall.corp.akamai.com>, David C La
wrence writes:
> Mark, please correct me if I am wrong (as I am sure you will!) but as
> I recall BIND9's adb didn't make a distinction between the SRTTs of
> different addresses on a name, but rather calculated an SRTT for the
> name as a whole.
> 
> Thus this:
> 
>     ns1.example.com A 192.168.1.1   (1 ns typical RTT)
>                     A 10.0.0.1      (100 ms typical RTT)
> 
> would behave differently from:
> 
>     ns1.example.com A 192.168.1.1   (1 ns typical RTT)
> 
>     ns2.example.com A 10.0.0.1      (100 ms typical RTT)
> 
> in that the former definition would see the 10.0.0.1 address used much
> more frequently than the latter, because both the 1 ns and 100 ms RTTs
> would be plugged into the calculation of the SRTT of ns1.example.com
> 
> Still true?  (Ever true?)

srtt are a property of the ip address not the name and always have been.
 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org