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Re: [Ice] Trickle ICE review

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 28 March 2017 18:20 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Ari Keränen <ari.keranen@ericsson.com>, Peter Saint-Andre <stpeter@stpeter.im>, Peter Thatcher <pthatcher@google.com>
CC: "ice@ietf.org" <ice@ietf.org>
Thread-Topic: [Ice] Trickle ICE review
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Date: Tue, 28 Mar 2017 18:19:53 +0000
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Subject: Re: [Ice] Trickle ICE review
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Hi,

I agree that adding a definition of "ICE session" to 5245bis is a good idea.

However, I am not sure simply saying "until a re-start would actually work". You may never do a re-start - often you simply terminate the session.

Also, in RFC 7675 we have the following text:

"That means that a new session, or an ICE restart,..."

...which seems to suggest that a new session and an ICE restart are not related. However, that's probably a minor issue, and we can fix that with an errata if needed.

Regards,

Christer




-----Original Message-----
From: Ice [mailto:ice-bounces@ietf.org] On Behalf Of Ari Keränen
Sent: 28 March 2017 19:43
To: Peter Saint-Andre <stpeter@stpeter.im>; Peter Thatcher <pthatcher@google.com>
Cc: ice@ietf.org
Subject: Re: [Ice] Trickle ICE review


> On 28 Mar 2017, at 11:27, Peter Saint-Andre <stpeter@stpeter.im> wrote:
> 
>>> - The name "ICE negotiation session" with definition of "A virtual
>>> session ..." is confusing.   I understand that we need a word for
>>> "period between restarts" and "period across restarts".  But what 
>>> does "virtual" mean in this context?  And what does "negotiation" 
>>> mean in "ICE negotiation session"?  Here's a possible suggestion: call it
>>> "single-exchange session".   A single-exchange session is the period
>>> from a single exchange of ICE description until the next exchange.  
>>> A "normal" ICE session is basically a multi-exchange session.
>> 
>>    This might be clearer:
>> 
>>       ICE Session:  All of the ICE-related interactions between ICE agents
>>          up until an ICE restart (if any).
>> 
>>    However, that definition probably belongs in 5245bis. The term as used
>>    in the Trickle specification is not limited to interactions between
>>    Trickle ICE agents.
>> 
>> 
>> I like that idea of using "ICE session" to mean the thing between 
>> restarts as long as it's compatible with 5245 and 5245bis and it 
>> doesn't cause confusion such that people think an "ICE session" is 
>> the time period across all ICE restarts.
>> 
>> I originally thought it should go in 5245bis also, but Ari thought it 
>> didn't make sense there since it would never use the term after 
>> defining it.
> 
> It's already used in 5245bis, isn't it? But we can continue to define 
> it in Trickle.

It's used but not defined actually. We'll add this to the terminology of 5245bis.


Cheers,
Ari
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