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Re: [DNSOP] [Ext] Alexey Melnikov's Discuss on draft-ietf-dnsop-dns-capture-format-08: (with DISCUSS and COMMENT)

Paul Hoffman <paul.hoffman@icann.org> Tue, 27 November 2018 01:58 UTC

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From: Paul Hoffman <paul.hoffman@icann.org>
To: Warren Kumari <warren@kumari.net>, Alexey Melnikov <aamelnikov@fastmail.fm>
CC: dnsop <dnsop@ietf.org>, The IESG <iesg@ietf.org>
Thread-Topic: [Ext] [DNSOP] Alexey Melnikov's Discuss on draft-ietf-dnsop-dns-capture-format-08: (with DISCUSS and COMMENT)
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Date: Tue, 27 Nov 2018 01:58:08 +0000
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Subject: Re: [DNSOP] [Ext] Alexey Melnikov's Discuss on draft-ietf-dnsop-dns-capture-format-08: (with DISCUSS and COMMENT)
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On Nov 26, 2018, at 5:44 PM, Warren Kumari <warren@kumari.net> wrote:
> Actually, there is - the tcpdump man pages (and actually all of their documentation!) lives in github - the version that this document references is:
> https://raw.githubusercontent.com/the-tcpdump-group/tcpdump-htdocs/7785b0d834e1f77a1d2ec56c96f51f4bf3bf3de2/manpages/pcap-filter.7.txt

Note that this URL is basically useless in an RFC that uses the current format: it is 135 characters long. It's cute that it points to the correct man page, but really not useful as a reference in an RFC as they are currently constituted.

Going back to Warren's original concern:

> We discussed this on the telechat, and I took the action to try look into this.
> One of the concerns with a normative reference to the webpage is what happens if it is updated to add a new primitive - is it allowed? If someone implements this on Thursday, can they still claim conformance if a new primitive is added on Friday?

For the CollectionParameters map, a "filters" item lists the filters that are used for this capture file. It truly doesn't matter if the reference is updated later: the capture still has the same filter string.

Thus, it is quite sufficient for this reference to be:
   http://www.tcpdump.org/manpages/pcap-filter.7.html
That is a useful reference for an implementer, and it fits in an RFC.

--Paul Hoffman

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