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Re: [Ice] draft-thatcher-ice-network-cost (was Re: STUN attribute 0xC057 - What is this?)

Peter Thatcher <pthatcher@google.com> Mon, 27 June 2016 19:35 UTC

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From: Peter Thatcher <pthatcher@google.com>
Date: Mon, 27 Jun 2016 12:34:52 -0700
Message-ID: <CAJrXDUHMgVyoNdZyK1VjYNuC4Bu4KE6ZZ0QP+vb0X3xNw8+ucQ@mail.gmail.com>
To: Adam Roach <adam@nostrum.com>
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Cc: Ross Finlayson <finlayson@live555.com>, ice@ietf.org
Subject: Re: [Ice] draft-thatcher-ice-network-cost (was Re: STUN attribute 0xC057 - What is this?)
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On Thu, Jun 9, 2016 at 7:10 PM, Adam Roach <adam@nostrum.com> wrote:

> On 6/9/16 8:15 PM, Ross Finlayson wrote:
>
>> (Apologies in advance for the slightly off-topic question)
>>
>> I’ve found that my STUN server (in my WebRTC server implementation) often
>> receives STUN Binding Requests that contain an unknown attribute type
>> 0xC057.  This attribute is always 4-bytes long, with each of the four bytes
>> being zero.
>>
>> This unknown attribute is sent by Chrome (and Opera) browsers, but
>> apparently never by Firefox.
>>
>> According to RFC 5389 (and IANA), STUN attribute 0xC057 is unassigned,
>> but is in the 'Designated Expert’ Comprehension-Optional range.
>>
>> Does anyone know what this is?
>>
>
> Yep, it's part of the webrtc.org code:
>
>
> https://chromium.googlesource.com/external/webrtc/+/6ab3db249b075e0e820a263d54804f521e7bc24b/webrtc/p2p/base/stun.h#611
>
> It appears to have been introduced here:
>
> https://codereview.webrtc.org/1815473002

​

>
> And it seems to be described, at least at a high level, here:
>
> https://tools.ietf.org/html/draft-thatcher-ice-network-cost-00
>
> ​
Yes, that's what it is.  ​
​  It's our implementation of the draft whereby an ICE endpoint can
indicate how much it thinks a network interface will cost to use (wifi vs
cell, for example).​




> Maybe Peter will explain his draft further? I would suggest that the IANA
> section, at least, is incorrect.
>
>
​I don't know what to say other than read the draft.  It's quite short.  I
will hopefully be presenting about it at IETF 96.

You are correct that I should update the IANA section of the draft to
indicate we'll need to register a STUN attribute (instead of the temporary
0xC057).



> /a
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