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

Joe Touch <touch@strayalpha.com> Sat, 11 November 2017 00:36 UTC

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Subject: Re: [v6ops] Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)
To: james woodyatt <jhw@google.com>, Fernando Gont <fgont@si6networks.com>
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
References: <be9724f5-2ff5-d90c-2749-ecae2c628b78@si6networks.com> <CAKD1Yr0_a2Qm8U4oK+BQU57DeDUD9i-o_+G+YhnH4pVXRxmxxQ@mail.gmail.com> <BBB987EF-D91C-4FD1-9084-21382F24E7BF@gmail.com> <37b58331-ecfc-aaf8-bde4-91dd4d375834@si6networks.com> <52C752BD-2347-4704-9103-89BD979D7C2D@google.com>
From: Joe Touch <touch@strayalpha.com>
Message-ID: <5fc6a1b1-7707-b5ab-7820-98f9f07b794c@strayalpha.com>
Date: Fri, 10 Nov 2017 16:36:34 -0800
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On 11/10/2017 1:58 PM, james woodyatt wrote:
>
> I think the definition of “protocol” in the New Oxford Dictionary is
> adequate.

The definition there is certainly true, but not adequate except for an
English paper. "rules" are too vague.

In networking, a protocol is:

    a set of rules
    a set of states
    a set of messages that are exchanged (often called the "on the wire"
part)
    a set of events/messages/actions that represent the behavior of each
endpoint (i.e., to upper layers)
    a set of time events
    a set of rules that relate incoming
messages/timer-events/user-actions and state to yield outgoing
messages/timer-sets/user-reports and new states

(the simplest way to express this is as a FSM, which is the most generic
form of computation where a machine cannot revoke its output - which is
why it accurately represents the ends of a protocol)

If you take away any of these (except state and, in limited cases,
time), you cease to have a useful protocol.

If you change any of these, you have a new protocol.

Joe