Re: [DNSOP] [internet-drafts@ietf.org: New Version Notification for draft-edmonds-dnsop-capabilities-00.txt]

"Paul Hoffman" <paul.hoffman@vpnc.org> Mon, 03 July 2017 16:49 UTC

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From: "Paul Hoffman" <paul.hoffman@vpnc.org>
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Date: Mon, 03 Jul 2017 09:49:23 -0700
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Subject: Re: [DNSOP] [internet-drafts@ietf.org: New Version Notification for draft-edmonds-dnsop-capabilities-00.txt]
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On 2 Jul 2017, at 20:53, Mark Andrews wrote:

> There are three things that made it hard to deploy new features.
>
> 1) Firewall vendor shipping firewalls with ridiculously strict rules
>    with zero evidence that they are needed.
>
> 2) Misimplementation of STD 13 and RFC 2671 by nameserver vendors.
>
> 3) Unknown EDNS option behaviour was not well defined by RFC 2671,
>    this is addressed in RFC 6891.
>
> 1 and 2 made it impossible to do a clean update from RFC 2671 to
> RFC 6891 which tightened the unknown EDNS option behaviour.  Proper
> implementation of RFC 2671 would have allowed the EDNS version 1
> to be used to signal that RFC 6891 unknown option behaviour is
> required.
>
> I don't see how adding a capabilities option will help here when
> the primary problem is bad code.

I do. The fact that some middleboxes and servers have bad code doesn't 
mean that all of them do.

--Paul Hoffman