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Re: [tram] WGLC draft-ietf-tram-alpn-00

"Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com> Wed, 10 September 2014 21:26 UTC

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From: "Gonzalo Salgueiro (gsalguei)" <gsalguei@cisco.com>
To: Martin Thomson <martin.thomson@gmail.com>
Thread-Topic: [tram] WGLC draft-ietf-tram-alpn-00
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Date: Wed, 10 Sep 2014 21:26:06 +0000
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Cc: Simon Perreault <sperreault@jive.com>, "tram@ietf.org" <tram@ietf.org>
Subject: Re: [tram] WGLC draft-ietf-tram-alpn-00
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On Sep 10, 2014, at 5:19 PM, Martin Thomson <martin.thomson@gmail.com> wrote:

> On 10 September 2014 13:46, Gonzalo Salgueiro (gsalguei)
> <gsalguei@cisco.com> wrote:
>> If folks think it is useful we can even throw in a wildcard label (stun.*) as a catch all implying whatever STUN usage.
> 
> I'd be surprised if you couldn't enumerate all the options up front.
> Inferring semantics based on a prefix is a dangerous precedent to set.
> Existing usages of ALPN rely on it being an opaque token.  It would be
> good to maintain that.
> 
> Not saying you shouldn't create consistency in the form of the labels
> though, just don't try to overload meaning on that.

Point taken.

> As far as uses go, the three you identify are the two that I think we
> might need.  That is, if you are talking to a TURN server, that's
> pretty clearly a good use for protocol identification.  Same applies
> to talking to a STUN server for NAT discovery purposes.  Not sure that
> I'd care to distinguish between NAT discovery and behaviour discovery
> though.

OK. We'll take a pass at defining labels with the principal STUN sub-usages as I described in my earlier email.  We'll forego the more esoteric ones to strike a balance between appropriate granularity and unnecessary label proliferation. You'll see this change in an -02 coming very soon.

Thanks again.

Gonzalo

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