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

Robert Edmonds edmonds at mycre.ws
Sun Sep 11 20:06:52 UTC 2016

Stephane Bortzmeyer wrote:
> 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 [...]"

Also, RFC 1033 appears to show historical nameserver names with multiple
address records. So the text in STD 13 isn't a theoretical concern.

Robert Edmonds

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