Re: [v6ops] Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)

james woodyatt <jhw@google.com> Fri, 10 November 2017 21:58 UTC

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From: james woodyatt <jhw@google.com>
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Subject: Re: [v6ops] Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)
Date: Fri, 10 Nov 2017 13:58:37 -0800
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Cc: IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>, "6man-ads@tools.ietf.org" <6man-ads@ietf.org>, "v6ops-ads@ietf.org" <v6ops-ads@ietf.org>, draft-ietf-v6ops-unique-ipv6-prefix-per-host@tools.ietf.org
To: Fernando Gont <fgont@si6networks.com>
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On Nov 10, 2017, at 12:23, Fernando Gont <fgont@si6networks.com>; wrote:
> 
> So, my request would be. For folks arguing that this document is not a
> protocol spec, could you please provide a definition of what a protocol
> is, and subsequently explain why/how such definition does not encompass
> this document?


I think the definition of “protocol” in the New Oxford Dictionary is adequate. Its entry includes a specialization for “Computing” that reads as follows:

	Computing a set of rules governing the exchange or transmission of data between devices.

This document does not introduce any new rules governing the exchange of data between a provider router and its subscriber hosts. It merely describes a strategy that providers may use under those rules for their routers to provide a set of unique prefixes to each subscriber host. The rules of the existing protocol specified by 6MAN remain unchanged, and one imagines that if 6MAN doesn’t approve of the strategy that V6OPS describes here, then it’s on 6MAN to revise the protocol accordingly.

One might think to counter that the strategy described here does include some explicit and implied requirements on provider routers to perform correctly the existing, already described, protocol for the indicated purpose, but those new requirements do not change the set of rules that govern the exchange, i.e. the protocol. In other words, this draft identifies only a set of further constraints on the behavior of one party in the protocol and describes those constraints as a Best Current Practice. Which is perfectly in line with the V6OPS charter.


--james woodyatt <jhw@google.com <mailto:jhw@google.com>>