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Re: [MMUSIC] ICE-SIP-SDP: Question on ice-pacing attribute

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 18 July 2019 22:09 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
CC: "mmusic@ietf.org" <mmusic@ietf.org>, "mmusic-chairs@ietf.org" <mmusic-chairs@ietf.org>, Cullen Jennings <fluffy@cisco.com>
Thread-Topic: [MMUSIC] ICE-SIP-SDP: Question on ice-pacing attribute
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Date: Thu, 18 Jul 2019 22:09:05 +0000
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Subject: Re: [MMUSIC] ICE-SIP-SDP: Question on ice-pacing attribute
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Hi,

>> Roman, did you have any opinion regarding Q1, whether we should allow to indicate pacing values smaller than 50ms?
>
> This is a complicated question. On one hand this value was set to avoid creating remote denial of service attacks using
> initial ICE connectivity checks. On the other hand, this value might be too high.
>
> So, my opinion that we should set the minimum pacing and ignore anything smaller, but the value might be lower 50ms.
> I think 50 ms value was set to avoid crashing a specific model of long deceased Linksys router. I remember Cullen giving a
> presentation about lower pacing values a while back, so I copied him on this email.

50 ms is the recommended value – per ICE agent.

Note that an endpoint might have multiple agents – e.g., a browser with multiple tabs, each doing ICE – and in that case the combined pacing must not be smaller than 5 ms.

But, in any case, this draft is not the place to define pacing value limits – that belongs to RFC 8445.

Regards,

Christer

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