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Re: [ppsp] peer protocol in WG last call

Arno Bakker <arno@cs.vu.nl> Thu, 29 November 2012 12:35 UTC

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Date: Thu, 29 Nov 2012 13:35:53 +0100
From: Arno Bakker <arno@cs.vu.nl>
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To: Riccardo Bernardini <riccardo.bernardini@uniud.it>
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Subject: Re: [ppsp] peer protocol in WG last call
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Hi Riccardo

please see inline:


On 23/11/2012 18:13, Riccardo Bernardini wrote:
>
> [Riccardo]
> No specific protocol comes to my mind.  I checked the RFC 6709 "Design
> Considerations for Protocol Extensions"
> (http://tools.ietf.org/html/rfc6709) for hints.  In Section 4.1 there
> is a list of possible solutions for protocol versioning.
[...]
> An alternative solution, where the option payload has a fixed length,
> could be that A puts the numbers of the oldest and the newest
> supported version and B picks one version in that interval.
>

I like the min/max versioning you propose here. I'll add a protocol 
option to hold the minimum version supported that is sent on the first 
HANDSHAKE in addition to the existing optional that will carry the max. 
The reply handshake will just have the existing version option that will 
contain the protocol selected by the receiver to use. If no common 
version is found, a closing HANDSHAKE is sent.

I'll update the draft soon to accommodate your and Yunfei's suggestions.

CU,
     Arno

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