[dns-operations] Announcement - DNS flag day on 2019-02-01

Mark Andrews marka at isc.org
Thu May 31 00:20:57 UTC 2018

It is attitudes like this that forced the IETF to not do a EDNS version bump
when RFC 6891 was written.  RFC 6891 would have been much cleaner if we could
have bumped the EDNS version number but there were too many authoritative servers
out there that mishandled EDNS version 1 queries to be able to do it.

Handling of unknown EDNS options was not well defined in RFC 2671.  The changes
made to define the behaviour for unknown EDNS options was significant enough that
a version bump was warranted.

AWS has had years to fix this.  Yes, you were informed that EDNS(1) handling was
broken years ago.  Saying that you don’t have time to do this does not cut it

> On 31 May 2018, at 6:06 am, Rayhelson, Michael <rayhelso at amazon.com> wrote:
> I think this is fair to say that we @ AWS are aware that we do not respond with BADVERS to EDNS1 requests, but we are not seeing any clear customer benefit in fixing this in the next few months.
> Is there something important we are missing in our assessment of the issue? (admittedly, I am completely missing the link between this behavior and " your domain might be become inaccessible")
>> Are there any Amazon AWS people here who can speak to their service failing tests?
>> https://ednscomp.isc.org/ednscomp/d59d64bb53
> On Tue, May 29, 2018 at 12:49:55PM +0200, Petr Špaček wrote:
>>> Dear DNS operators,
>>> you might be interested in information about "DNS flag day" coordinated by
>>> open-source DNS vendors and is planned for 2019-02-01
>>> (February 1st 2019).
>>> Further information can be found on
>>> https://dnsflagday.net/
>>> Please post comments related to content of the web site or similar as Github
>>> issues:
>>> https://github.com/dns-violations/dnsflagday
>>> I hope you find the information useful.
>>> : 
>>> -- 
>> Petr Špaček  @  CZ.NIC
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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

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