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Re: [rtcweb] nombis and ICE restart [was: Comment on consent-freshness-14]

Christer Holmberg <christer.holmberg@ericsson.com> Sat, 20 June 2015 11:40 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Harald Alvestrand <harald@alvestrand.no>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: [rtcweb] nombis and ICE restart [was: Comment on consent-freshness-14]
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Date: Sat, 20 Jun 2015 11:40:09 +0000
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Subject: Re: [rtcweb] nombis and ICE restart [was: Comment on consent-freshness-14]
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Hi Harald,

>> (Changed the subject, because ICE restart with nombis is not related 
>> to consent-freshness)
>>
>> Hi,
>>
>>>> In recent moons people have been talking about never finalizing ICE, 
>>>> instead you will keep collecting candidates throughout the session, 
>>>> and switch between them if one is "better" than that other. You may 
>>>> drop some candidates, and you may maintain others (even though you 
>>>> are currently not sending any data on them)
>>> [BA] A specific proposal is here:
>>> https://tools.ietf.org/html/draft-uberti-mmusic-nombis
>> Correct, I forgot to include the link.
>>
>>>> That brings up a question, though: if you never finalize ICE, will you ever be able to do an ICE restart?
>>> ICE can always be restarted, whether media is currently flowing or not.
>> Sure, but my question was more general whether you can do ICE restart if you use nombis.
>>
>> When reading the nombis draft, it does say that you can perform an ICE restart. But, is there any reason for doing it, as you can simply continue >> collecting new candidates (and drop the ones you don't want to use anymore, I assume) using "normal nombis behaviour"?
>
> If you believe the ICE credentials at the other end have been lost or compromised, or if you've lost your own ICE credentials (relevant in the 
> rehydration case, if rehydration is possible to do), an ICE restart is a Good Thing.
>
> With nombis, losing the connection should not be a reason to do an ICE restart.

I think it would be good to capture what you just said in the nombis draft, e.g. in an "ICE Restart Considerations"/"To ICE Restart or not to ICE restart" section.

Regards,

Christer

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