[dns-operations] Using all the addresses of every name server? (Was: ANY efforts at taking additional responses more compact?

Stephane Bortzmeyer bortzmeyer at nic.fr
Sun Sep 11 19:09:44 UTC 2016

On Wed, Sep 07, 2016 at 05:33:48PM +0900,
 Paul Vixie <paul at redbarn.org> wrote 
 a message of 30 lines which said:

> but the non-unrolling behaviour is reasonable and it is compliant

Really? I read RFC 1035, section 4.2.1, and specially 7.2, as saying
that a resolver must (not RFC 2119 MUST, RFC 1035 was written before)
try all IP addresses of an authoritative name server. RFC 1034,
section 5.3.3 is even clearer "The strategy is to cycle around all of
the addresses for all of the servers with a timeout between each
transmission.  In practice it is important to use all addresses of a
multihomed host [...]"

[Which does not mean it is properly implemented by everyone, of

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