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Re: [MMUSIC] RFC 5245: ice-ufrags of length 256 vs stun maximum username length of 512 bytes

Ari Keränen <ari.keranen@ericsson.com> Mon, 04 November 2013 05:47 UTC

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Date: Sun, 03 Nov 2013 21:47:31 -0800
From: Ari Keränen <ari.keranen@ericsson.com>
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To: Philipp Hancke <fippo@goodadvice.pages.de>
References: <520B299F.9060409@goodadvice.pages.de> <CABkgnnVMTjNfBQYUa5if-o4vKaxB_7NguAZJ8qiu=_mGDF9ePQ@mail.gmail.com> <alpine.DEB.2.00.1308160938080.14145@lo.psyced.org> <CABkgnnXLjAtkFk-b_4bEodJLJdbx7nbEGaSaZE_JxC4R45ZKYw@mail.gmail.com> <5276DA6D.9040904@ericsson.com> <52773432.20100@goodadvice.pages.de>
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] RFC 5245: ice-ufrags of length 256 vs stun maximum username length of 512 bytes
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On 11/3/13 9:44 PM, Philipp Hancke wrote:
>> Apparently a simple fix would be to make offered ice-ufrag max length in
>> ICE-bis 255 (instead of 256).
>>
>> This would even be nicely backward-compatible since the other (legacy)
>> endpoint can still offer 256 chars long ufrag and we would not end up
>> exceeding the max length for STUN username.
>
> And on the other side, if an ice-bis endpoint receives a ice-ufrag of
> length 256 from a "legacy" endpoint, it can still restrict it's reply to
> 255 chars.
> This might be easier to describe as "accept 256 chars, but do not send
> more than 255 chars".

Exactly.


Cheers,
Ari

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