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Re: [DNSOP] draft-ietf-dnsop-extended-error code options

Geoff Huston <gih@apnic.net> Mon, 13 November 2017 21:38 UTC

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From: Geoff Huston <gih@apnic.net>
In-Reply-To: <3FFE9D39-DD16-4863-9F9B-46D585F90BF1@hopcount.ca>
Date: Tue, 14 Nov 2017 08:37:55 +1100
Cc: tjw ietf <tjw.ietf@gmail.com>, dnsop <dnsop@ietf.org>, Wes Hardaker <wjhns1@hardakers.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/P3qoVNB0vyqNeYZKtYf4z_tFskc>
Subject: Re: [DNSOP] draft-ietf-dnsop-extended-error code options
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> On 14 Nov 2017, at 8:19 am, Joe Abley <jabley@hopcount.ca> wrote:
> 
> Hi Geoff,
> 
> I think the number 4 on the slide was different from the one in the mail.


I thought so too, but I wasn’t sure if it was me not paying attention in the WG meeting or not!

> 
> The option on the slide that I mentioned I liked the most was the one that didn't copy the RCODE value from the header, but in effect provided a 16/32/whatever-bit sub-code for whatever the RCODE happened to be.


and that makes sense to me, considering my perspective of the risk associated with duplication of protocol field values

> 
> So, for each permissible value of the RCODE field, this new field would provide additional information that was relevant to that value.
> 
> Compared to the other options presented, this avoids having to specify behaviour for all the unhelpful corner cases of RCODE in message header doesn't match the copy in the new field, new field value (e.g. "validation failed" or something) doesn't make sense for this particular RCODE (e.g. "NOERROR"), etc.
> 

thanks Joe,

   Geoff

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