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

Joe Touch <> 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 <>, Fernando Gont <>
Cc: IPv6 Operations <>, "" <>, "" <>, "" <>,
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From: Joe Touch <>
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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"
    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.