Re: [rtcweb] Consent Freshness: Some suggestions for editorial clarifications

Hi Christer,

On Wed, Sep 17, 2014 at 1:11 PM, Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

>  Hi,
>
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> Based on feedback I receive from implementers, there are a couple of
> clarifications I think would be useful in the consent freshness draft.
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> Q1:
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> As STUN binding requests for consent are sent unreliably, and are not
> re-transmitted, I think it would be useful to have some explicit text
> saying that individual requests (and/or their associated responses) may get
> lost in the network, and that a sender must be prepared that a response to
> such requestmay never arrive.
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> It may be obvious to us, but maybe not as clear to the first-time reader
> of the draft.
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> Q2:
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> Section 4.1 says:
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> “That is, if a valid STUN binding response corresponding to one of the
> STUN requests sent in the last 30 seconds
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>                 has not been received from the remote peer's Transport
> Address, the endpoint MUST cease transmission on that 5-tuple.”
>
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> First, I suggest the following clarification:
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> s/”to one of the STUN requests sent in the last 30 seconds”/”to one of the
> STUN requests (not necessarily the last one) sent in the last 30 seconds”.
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> Second, there is no explicit text on for how long the client keeps the
> STUN transaction alive, i.e. for how long it waits for the response.
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> I assume that, after 30 seconds, the client does not need to maintain
> state and wait for the response anymore.
>

My understanding is that the sender doesn't need remember the request for
30 sec, instead it needs to remember it only for RTT duration. If a
matching response is received within that duration you have a 'hit'. If
there is no 'hit' over the last 30 sec, consent expires.

I agree this isn't clear in the current version.

Muthu

I think it would be useful to explicitly indicate that, and also say that
> responses that are received after that time must be discarded.
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> Thanks!
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> Regards,
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> Christer
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