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Re: [tram] Fwd: Last Call: <draft-ietf-tram-alpn-06.txt> (Application Layer Protocol Negotiation (ALPN) labels for Session Traversal Utilities for NAT (STUN) Usages) to Proposed Standard

Martin Thomson <martin.thomson@gmail.com> Wed, 29 October 2014 00:25 UTC

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Date: Tue, 28 Oct 2014 17:25:40 -0700
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From: Martin Thomson <martin.thomson@gmail.com>
To: Simon Perreault <sperreault@jive.com>
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Subject: Re: [tram] Fwd: Last Call: <draft-ietf-tram-alpn-06.txt> (Application Layer Protocol Negotiation (ALPN) labels for Session Traversal Utilities for NAT (STUN) Usages) to Proposed Standard
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On 28 October 2014 07:25, Simon Perreault <sperreault@jive.com> wrote:
> Re-reading the draft again, if we delete those use cases, we are left
> with... nothing. I don't see any use case for ALPN in STUN/TURN that does
> not involve middleboxes. I don't see the point of STUN usage negotiation
> since all usages speak the same protocol (STUN) and will be "negotiated"
> implicitly later on, when a usage-specific message is emitted. So... why are
> we doing this again?

What ALPN does is provide an unambiguous identification of the
intended protocol.  That allows for use of multiple protocols (TURN v2
perhaps!) on the same port.  The uses for HTTP and WebRTC do this
already.  Maybe it's not important for TURN.

If you are concerned about this, perhaps the working group might be
consulted.  I'll confess, I always sort of assumed that you knew what
you were doing here, so I didn't think much on the issue.

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