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Re: [MMUSIC] SCTP AppID

Harald Alvestrand <harald@alvestrand.no> Mon, 10 March 2014 12:26 UTC

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Date: Mon, 10 Mar 2014 13:26:33 +0100
From: Harald Alvestrand <harald@alvestrand.no>
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To: Martin Thomson <martin.thomson@gmail.com>
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Subject: Re: [MMUSIC] SCTP AppID
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On 03/07/2014 12:22 PM, Martin Thomson wrote:
> On 7 March 2014 11:10, Harald Alvestrand <harald@alvestrand.no> wrote:
>> One irritating case in our particular use case is that we actually don't
>> know the lowest layers ahead of time.
> The fact that we are using wired Ethernet vs. WiFi is generally not
> visible at the level we're doing this identification either.
>
> If it does not matter to the protocol semantics, then I believe it to
> be safe to use the same identifier for two similar-but-not-identical
> stacks.
>
> Yes, one might argue that TURN-TCP encapsulation is tangibly different
> to non-encapsulated SRTP.  We can talk about those distinctions and
> whether they require different identifiers, but in this case, I don't
> see any need for distinction.
I think we're both arguing that a tag should only identify
SCTP-over-DTLS as the protocol stack. If so, we agree,

No opinion on whether ALPN is useful for our use case; I don't
understand it yet (haven't read the spec), so haven't formed one.

          Harald

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