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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, Alan Ford <alan.ford@gmail.com>, "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, "Tom Kristensen" <tomkri@ifi.uio.no>
Thread-Topic: [bfcpbis] BFCPbis: UDP- and TCP candidates and proto value
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Date: Fri, 4 Nov 2016 15:38:00 +0000
Message-ID: <F27839ED-3E3A-4613-8C13-41F95177DE3F@cisco.com>
References: <9BE360E6-8462-49BC-9491-7143D476EEAD@cisco.com> <28B9D43D-FF01-4294-BCD6-93E72C0C07E1@gmail.com> <D426777A.11238%christer.holmberg@ericsson.com> <42A8BAE9-A6C2-4112-97FC-2DAE01F9AB0D@gmail.com> <D42A6D07.1138D%christer.holmberg@ericsson.com> <D42D3DE9.11645%christer.holmberg@ericsson.com> <EC53FDEE-0A52-488D-AF36-EDACE0A69232@gmail.com> <D42D4B50.1165E%christer.holmberg@ericsson.com> <35E11A60-C03F-43CF-9958-4E93EC499FF6@cisco.com> <7594FB04B1934943A5C02806D1A2204B4BDCE32C@ESESSMB209.ericsson.se>
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Cc: "bfcpbis@ietf.org" <bfcpbis@ietf.org>, Roman Shpount <roman@telurix.com>
Subject: Re: [bfcpbis] BFCPbis: UDP- and TCP candidates and proto value
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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, Paul Kyzivat <pkyzivat@alum.mit.edu>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>
Thread-Topic: [bfcpbis] I-D Action: draft-ietf-bfcpbis-rfc4583bis-15.txt
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Date: Fri, 4 Nov 2016 15:42:47 +0000
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Subject: Re: [bfcpbis] I-D Action: draft-ietf-bfcpbis-rfc4583bis-15.txt
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, Alan Ford <alan.ford@gmail.com>, "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, "Tom Kristensen" <tomkri@ifi.uio.no>
Thread-Topic: [bfcpbis] BFCPbis: UDP- and TCP candidates and proto value
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Subject: Re: [bfcpbis] BFCPbis: UDP- and TCP candidates and proto value
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, Paul Kyzivat <pkyzivat@alum.mit.edu>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>
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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, Alan Ford <alan.ford@gmail.com>, "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, "Tom Kristensen" <tomkri@ifi.uio.no>
Thread-Topic: [bfcpbis] BFCPbis: UDP- and TCP candidates and proto value
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Date: Sat, 5 Nov 2016 22:14:58 +0000
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References: <9BE360E6-8462-49BC-9491-7143D476EEAD@cisco.com> <28B9D43D-FF01-4294-BCD6-93E72C0C07E1@gmail.com> <D426777A.11238%christer.holmberg@ericsson.com> <42A8BAE9-A6C2-4112-97FC-2DAE01F9AB0D@gmail.com> <D42A6D07.1138D%christer.holmberg@ericsson.com> <D42D3DE9.11645%christer.holmberg@ericsson.com> <EC53FDEE-0A52-488D-AF36-EDACE0A69232@gmail.com> <D42D4B50.1165E%christer.holmberg@ericsson.com> <35E11A60-C03F-43CF-9958-4E93EC499FF6@cisco.com> <7594FB04B1934943A5C02806D1A2204B4BDCE32C@ESESSMB209.ericsson.se> <F27839ED-3E3A-4613-8C13-41F95177DE3F@cisco.com> <7594FB04B1934943A5C02806D1A2204B4BE1E415@ESESSMB209.ericsson.se>
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Subject: Re: [bfcpbis] BFCPbis: UDP- and TCP candidates and proto value
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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, Paul Kyzivat <pkyzivat@alum.mit.edu>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>
Thread-Topic: [bfcpbis] I-D Action: draft-ietf-bfcpbis-rfc4583bis-15.txt
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From: Alan Ford <alan.ford@gmail.com>
In-Reply-To: <CAD5OKxu15YgYO0xyWMYXv7VTAVVQ71iJhH_txt31BV0CvCSjqg@mail.gmail.com>
Date: Fri, 18 Nov 2016 01:14:10 +0000
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To: Roman Shpount <roman@telurix.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bfcpbis/bqhYVR7t0MxD4JMoM4i28Xx0ldc>
Cc: bfcpbis@ietf.org, ice@ietf.org, "mmusic@ietf.org" <mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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Adding bfcpbis.

You raise a good point Roman - there=E2=80=99s no definition of how to =
actually use ICE with BFCP at the protocol level - this only came up in =
some very late reviews of 4582bis. The initial suggestion was to use the =
same text as in draft-ietf-mmusic-sctp-sdp-19, but it then raised the =
point that, given BFCP does not have a MTI protocol, if the offerer =
supported both they would include their preferred option, but if the =
receiver supported the other variant, there=E2=80=99s no way to =
immediately negotiate that without a re-INVITE.

Christer=E2=80=99s suggestion to relax the requirement that the m-line =
protocol in the answer matches one of the ICE candidates would support =
the case where the offerer supports both but prefers UDP, but the =
answerer only supports TCP. Although no implementations currently do ICE =
here, this relaxation would leave the door open to gaining this =
negotiation flexibility in bfcpbis implementations. There seems no =
reason to have this requirement applied to the answer in the first =
place.

I don=E2=80=99t understand the comment about SBCs; today, tcp candidates =
are used for media and data channels end-to-end in WebRTC, to name but =
one implementation.

Regards,
Alan

> On 17 Nov 2016, at 03:05, Roman Shpount <roman@telurix.com> wrote:
>=20
> Adding ICE group to this message.
>=20
> The approach always was that tcp candidates can potentially go only as =
far as SBC and then be terminated by UDP transport. Because of this =
everything transmitted over tcp candidate was still considered to be =
transmitted over the unreliable out-of-order transport. It is also =
assumed that candidates can switch from UDP to TCP based candidate =
during nomination. This is why, for instance, we run DTLS with RFC4571 =
framing over tcp candidates, not TLS. Because of this I always thought =
that ICE is UDP first with additional TCP transports for situation when =
UDP will not work. So, as a result, I think ICE-bis should specify that =
UDP MUST be supported and default candidate MUST be UDP. ICE SDP can =
reflect this, but I think this is the underlying protocol requirement.
>=20
> I also wanted to add that BFCP needs to examine how ICE support is =
implemented by this protocol. I think it is not covered in the current =
drafts. I also think I do not think it is possible for TCP/BFCP to run =
over ICE. On the other hand UDP/DTLS/BFCP and TCP/DTLS/BFCP would =
trivial based on current DTLS work.
>=20
> Regards,
> _____________
> Roman Shpount
>=20
> On Wed, Nov 16, 2016 at 8:44 PM, Christer Holmberg =
<christer.holmberg@ericsson.com <mailto:christer.holmberg@ericsson.com>> =
wrote:
> I have no problem with Roman=E2=80=99s must-support-UDP suggestion. I =
guess the question is whether the BFCP folks could accept that. Cullen =
did say that TCP-based BFCP deployments have been around for a decade. =
But, do they support ICE?
>=20
> =20
>=20
> If we decide to move forward with such approach, we need to ask =
ourselves whether must-support-UDP should be an ICE requirement (in =
which case the suggestion should be brought to the ICE WG) or whether it =
should only be an ICE-using-SIP-SDP requirement.
>=20
> =20
>=20
> Regards,
>=20
> =20
>=20
> Christer
>=20
> =C2=A0 <>
> From: mmusic [mailto:mmusic-bounces@ietf.org =
<mailto:mmusic-bounces@ietf.org>] On Behalf Of Roman Shpount
> Sent: 17 November 2016 00:52
> To: mmusic@ietf.org <mailto:mmusic@ietf.org>
> Subject: [MMUSIC] m=3D line protocol in case of ICE
>=20
> =20
>=20
> Hi All,
>=20
> =20
>=20
> I just wanted to return to the m=3D line protocol issue that Christer =
raised during the last MMUSIC session.
>=20
> =20
>=20
> All the ICE implementations I've seen are primarily UDP based with =
support for tcp host candidates which are primarily used to connect to =
end points on public IP. If all ICE implementations are continue to be =
primarily UDP based, then the simplest solution would be to require UDP =
support when any given protocol is implemented over ICE. DTLS and RTP =
are already primarily UDP based so this is a non-requirement. Even more, =
all protocols that are implemented on top of ICE must assume that =
underling transports (including tcp candidates) are unreliable, since =
candidate pair can change at any time between reliable and unreliable =
transports, so this makes them different from protocols implemented on =
plain TCP or TLS.
>=20
> =20
>=20
> So the first question I wanted to ask is anybody interested in TCP =
only ICE implementation where the protocol running on top of such =
implementation relies on the reliable delivery of underlying messages? =
By this I mean, does anybody wants implement TCP based ICE, with =
simultaneous open, reflexive and relay candidates in such a way that ICE =
implementation will run from behind NAT without ever needing a UDP =
candidate?
>=20
> =20
>=20
> I understand that BFCP was used for a long time, but I do not think =
TCP/BFCP or TCP/TLS/BFCP can even be used with ICE. I think only =
UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP can even support ICE.=20
>=20
> =20
>=20
> I think both rfc4582bis and rfc4583bis need a careful review and =
additional sections that describe ICE considerations. I think the most =
obvious thing would be to specify that ICE can only be supported by =
UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP. It will also mean in which =
case RFC4571 is used when tcp candidates are used. Furthermore, when tcp =
candidate is selected with UDP/BFCP transport, it is not the same thing =
as using TCP/BFCP and will need a different transport tag (something =
like TCP/UDP/BFCP). Alternatively we can require that only secure =
versions of BFCP are used with ICE and only allow ICE usage for =
UDP/DTLS/BFCP and TCP/DTLS/BFCP.
>=20
> =20
>=20
> To conclude, I would argue that the simplest solution would be that =
for all protocols implemented on top of ICE, UDP MUST be supported and =
default candidates MUST be UDP based. This avoids building uncomfortable =
artificial constructs to avoid ICE mismatch and requires minimal changes =
to existing specifications.
>=20
> =20
>=20
> Regards,
>=20
> _____________
> Roman Shpount
>=20
>=20
> _______________________________________________
> mmusic mailing list
> mmusic@ietf.org
> https://www.ietf.org/mailman/listinfo/mmusic


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Adding bfcpbis.<div class=3D""><br class=3D""></div><div =
class=3D"">You raise a good point Roman - there=E2=80=99s no definition =
of how to actually use ICE with BFCP at the protocol level - this only =
came up in some very late reviews of 4582bis. The initial suggestion was =
to use the same text as in&nbsp;draft-ietf-mmusic-sctp-sdp-19, but it =
then raised the point that, given BFCP does not have a MTI protocol, if =
the offerer supported both they would include their preferred option, =
but if the receiver supported the other variant, there=E2=80=99s no way =
to immediately negotiate that without a re-INVITE.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Christer=E2=80=99s =
suggestion to relax the requirement that the m-line protocol <i =
class=3D"">in the answer</i>&nbsp;matches one of the ICE candidates =
would support the case where the offerer supports both but prefers UDP, =
but the answerer only supports TCP. Although no implementations =
currently do ICE here, this relaxation would leave the door open to =
gaining this negotiation flexibility in bfcpbis implementations. There =
seems no reason to have this requirement applied to the answer in the =
first place.</div><div class=3D""><br class=3D""></div><div class=3D"">I =
don=E2=80=99t understand the comment about SBCs; today, tcp candidates =
are used for media and data channels end-to-end in WebRTC, to name but =
one implementation.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Regards,</div><div class=3D"">Alan</div><div class=3D""><br =
class=3D""></div><div class=3D""><div><blockquote type=3D"cite" =
class=3D""><div class=3D"">On 17 Nov 2016, at 03:05, Roman Shpount =
&lt;<a href=3D"mailto:roman@telurix.com" =
class=3D"">roman@telurix.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D""><div class=3D"">Adding ICE group to this message.</div><div =
class=3D""><br class=3D""></div>The approach always was that tcp =
candidates can potentially go only as far as SBC and then be terminated =
by UDP transport. Because of this everything transmitted over tcp =
candidate was still considered to be transmitted over the unreliable =
out-of-order transport. It is also assumed that candidates can switch =
from UDP to TCP based candidate during nomination. This is why, for =
instance, we run DTLS with RFC4571 framing over tcp candidates, not TLS. =
Because of this I always thought that ICE is UDP first with additional =
TCP transports for situation when UDP will not work. So, as a result, I =
think ICE-bis should specify that UDP MUST be supported and default =
candidate MUST be UDP. ICE SDP can reflect this, but I think this is the =
underlying protocol requirement.<div class=3D""><br class=3D""></div><div =
class=3D"">I also wanted to add that BFCP needs to examine how ICE =
support is implemented by this protocol. I think it is not covered in =
the current drafts. I also think I do not think it is possible for =
TCP/BFCP to&nbsp;run over ICE. On the other hand UDP/DTLS/BFCP and =
TCP/DTLS/BFCP would trivial based on current DTLS work.<br class=3D""><div=
 class=3D""><div class=3D"gmail_extra"><br class=3D""></div><div =
class=3D"gmail_extra">Regards,<br clear=3D"all" class=3D""><div =
class=3D""><div class=3D"gmail_signature">_____________<br =
class=3D"">Roman Shpount</div></div>
<br class=3D""><div class=3D"gmail_quote">On Wed, Nov 16, 2016 at 8:44 =
PM, Christer Holmberg <span dir=3D"ltr" class=3D"">&lt;<a =
href=3D"mailto:christer.holmberg@ericsson.com" target=3D"_blank" =
class=3D"">christer.holmberg@ericsson.com</a>&gt;</span> wrote:<br =
class=3D""><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-GB" class=3D"">
<div class=3D"gmail-m_4315692423899779813WordSection1"><p =
class=3D"MsoNormal"><span =
style=3D"color:rgb(31,73,125);font-family:calibri,sans-serif;font-size:11p=
t" class=3D"">I have no problem with Roman=E2=80=99s must-support-UDP =
suggestion. I guess the question is whether the BFCP folks could accept =
that. Cullen
 did say that TCP-based BFCP deployments have been around for a decade. =
But, do they support ICE?</span><br class=3D""></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,125=
)" class=3D""><u class=3D""></u>&nbsp;<u class=3D""></u></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,125=
)" class=3D"">If we decide to move forward with such approach, we need =
to ask ourselves whether must-support-UDP should be an ICE requirement =
(in
 which case the suggestion should be brought to the ICE WG) or whether =
it should only be an ICE-using-SIP-SDP requirement.
<u class=3D""></u><u class=3D""></u></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,125=
)" class=3D""><u class=3D""></u>&nbsp;<u class=3D""></u></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,125=
)" class=3D"">Regards,<u class=3D""></u><u class=3D""></u></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,125=
)" class=3D""><u class=3D""></u>&nbsp;<u class=3D""></u></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,125=
)" class=3D"">Christer<u class=3D""></u><u class=3D""></u></span></p><p =
class=3D"MsoNormal"><a name=3D"m_4315692423899779813__MailEndCompose" =
class=3D""><span =
style=3D"font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,125=
)" class=3D""><u class=3D""></u>&nbsp;<u class=3D""></u></span></a></p><p =
class=3D"MsoNormal"><b class=3D""><span lang=3D"EN-US" =
style=3D"font-size:11pt;font-family:calibri,sans-serif" =
class=3D"">From:</span></b><span lang=3D"EN-US" =
style=3D"font-size:11pt;font-family:calibri,sans-serif" class=3D""> =
mmusic [mailto:<a href=3D"mailto:mmusic-bounces@ietf.org" =
target=3D"_blank" class=3D"">mmusic-bounces@ietf.<wbr class=3D"">org</a>]
<b class=3D"">On Behalf Of </b>Roman Shpount<br class=3D"">
<b class=3D"">Sent:</b> 17 November 2016 00:52<br class=3D"">
<b class=3D"">To:</b> <a href=3D"mailto:mmusic@ietf.org" target=3D"_blank"=
 class=3D"">mmusic@ietf.org</a><br class=3D"">
<b class=3D"">Subject:</b> [MMUSIC] m=3D line protocol in case of ICE<u =
class=3D""></u><u class=3D""></u></span></p><div class=3D""><div =
class=3D"gmail-h5"><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
<div class=3D""><p class=3D"MsoNormal">Hi All,<u class=3D""></u><u =
class=3D""></u></p>
<div class=3D""><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">I just wanted to return to the m=3D=
 line protocol issue that Christer raised during the last MMUSIC =
session.<u class=3D""></u><u class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">All the ICE implementations I've =
seen are primarily UDP based with support for tcp host candidates which =
are primarily used to connect to end points on public IP. If all ICE =
implementations are continue to be primarily UDP based, then the
 simplest solution would be to require UDP support when any given =
protocol is implemented over ICE. DTLS and RTP are already primarily UDP =
based so this is a non-requirement. Even more, all protocols that are =
implemented on top of ICE must assume that underling
 transports (including tcp candidates) are unreliable, since candidate =
pair can change at any time between reliable and unreliable transports, =
so this makes them different from protocols implemented on plain TCP or =
TLS.<u class=3D""></u><u class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">So the first question I wanted to =
ask is anybody interested in TCP only ICE implementation where the =
protocol running on top of such implementation relies on the reliable =
delivery of underlying messages? By this I mean, does anybody wants
 implement TCP based ICE, with simultaneous open, reflexive and relay =
candidates in such a way that ICE implementation will run from behind =
NAT without ever needing a UDP candidate?<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">I understand that BFCP was used =
for a long time, but I do not think TCP/BFCP or TCP/TLS/BFCP can even be =
used with ICE. I think only UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP =
can even support ICE.&nbsp;<u class=3D""></u><u class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">I think both&nbsp;rfc4582bis and =
rfc4583bis need a careful review and additional sections that describe =
ICE considerations. I think the most obvious thing would be to specify =
that ICE can only be supported by UDP/BFCP, UDP/DTLS/BFCP and =
TCP/DTLS/BFCP.
 It will also mean in which case RFC4571 is used when tcp candidates are =
used. Furthermore, when tcp candidate is selected with UDP/BFCP =
transport, it is not the same thing as using TCP/BFCP and will need a =
different transport tag (something like TCP/UDP/BFCP).
 Alternatively we can require that only secure versions of BFCP are used =
with ICE and only allow ICE usage for UDP/DTLS/BFCP and TCP/DTLS/BFCP.<u =
class=3D""></u><u class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">To conclude, I would argue that =
the simplest solution would be that for all protocols implemented on top =
of ICE, UDP MUST be supported and default candidates MUST be UDP based. =
This avoids building uncomfortable artificial constructs to
 avoid ICE mismatch and requires minimal changes to existing =
specifications.<u class=3D""></u><u class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Regards,<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D"">
<div class=3D"">
<div class=3D""><p class=3D"MsoNormal">_____________<br class=3D"">
Roman Shpount<u class=3D""></u><u class=3D""></u></p>
</div>
</div>
</div>
</div>
</div></div></div>
</div>

</blockquote></div><br class=3D""></div></div></div></div>
_______________________________________________<br class=3D"">mmusic =
mailing list<br class=3D""><a href=3D"mailto:mmusic@ietf.org" =
class=3D"">mmusic@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/mmusic<br =
class=3D""></div></blockquote></div><br class=3D""></div></body></html>=

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From: Roman Shpount <roman@telurix.com>
Date: Thu, 17 Nov 2016 21:13:35 -0500
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Cc: bfcpbis@ietf.org, ice@ietf.org, "mmusic@ietf.org" <mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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Hi All,

There are three comments I wanted to make regarding general nature of all
existing protocols designed to work ICE

1. Protocols running on top of ICE assume that regardless what candidate
pair is used, including tcp candidates, the underlying network transport is
unordered and unreliable. During nomination, including continuous
nomination, candidate pairs can switch, including switching from udp to tcp
or from tcp to udp. This typically means that protocol re-transmit timers
are operational, packets are re-ordered at the protocol level, and
 UDP-friendly packet sizes are used even when packets are sent over tcp
candidates. For instance DTLS and SCTP re-transmit timers, reordering, and
fragmentation support are still running when tcp candidates are used.

2. Protocols do not assume that particular candidate network transport runs
all the way from origination to final destination of the protocol packets.
For instance there are SBC which only handle ICE. These SBC run the ICE
state machine and then transmit the underlying protocol data to the final
destination using public IP. Because of this, it is not unusual for RTP to
run over tcp candidate until SBC and then run over UDP to the final
destination. This is one more reason why re-transmit timers and other
mechanisms used to deal with UDP are still running over tcp candidates.

3. I am not aware of any current protocol running over ICE tcp candidates
which is not using RFC4571 framing. For instance DTLS could have been
implemented using DTLS protocol framing without RFC4571 over tcp
candidates, but this was not the case. This is partially done to simplify
implementation of SBC which terminate ICE and transmit protocol data using
UDP. By using RFC 4571 framing, SBC can packetize/de-packetize data
transmitted over tcp candidates without knowing protocol details.

To conclude, up until this point ICE tcp candidates were not treated as
reliable transport and served simply as another way to transmit UDP packets
through firewalls. Because of this, I would argue that BFCP running over
tcp candidate is not the same as TCP/BFCP, in the same way as DTLS running
over tcp candidate is not TLS.

I would also argue that any protocol running over ICE is, in essence, a UDP
based protocol, using tcp candidates only as a fall back mechanism for
firewall traversal, same way as when data is relayed over TURN TCP, it is
still considered sent over UDP at the protocol level.

If ICE group agrees, I think this should be documented by saying that UDP
is a MUST implement for any protocol using ICE and that default candidate
should be UDP based.

Regards,
_____________
Roman Shpount

On Thu, Nov 17, 2016 at 8:14 PM, Alan Ford <alan.ford@gmail.com> wrote:

> Adding bfcpbis.
>
> You raise a good point Roman - there=E2=80=99s no definition of how to ac=
tually
> use ICE with BFCP at the protocol level - this only came up in some very
> late reviews of 4582bis. The initial suggestion was to use the same text =
as
> in draft-ietf-mmusic-sctp-sdp-19, but it then raised the point that,
> given BFCP does not have a MTI protocol, if the offerer supported both th=
ey
> would include their preferred option, but if the receiver supported the
> other variant, there=E2=80=99s no way to immediately negotiate that witho=
ut a
> re-INVITE.
>
> Christer=E2=80=99s suggestion to relax the requirement that the m-line pr=
otocol *in
> the answer* matches one of the ICE candidates would support the case
> where the offerer supports both but prefers UDP, but the answerer only
> supports TCP. Although no implementations currently do ICE here, this
> relaxation would leave the door open to gaining this negotiation
> flexibility in bfcpbis implementations. There seems no reason to have thi=
s
> requirement applied to the answer in the first place.
>
> I don=E2=80=99t understand the comment about SBCs; today, tcp candidates =
are used
> for media and data channels end-to-end in WebRTC, to name but one
> implementation.
>
> Regards,
> Alan
>
> On 17 Nov 2016, at 03:05, Roman Shpount <roman@telurix.com> wrote:
>
> Adding ICE group to this message.
>
> The approach always was that tcp candidates can potentially go only as fa=
r
> as SBC and then be terminated by UDP transport. Because of this everythin=
g
> transmitted over tcp candidate was still considered to be transmitted ove=
r
> the unreliable out-of-order transport. It is also assumed that candidates
> can switch from UDP to TCP based candidate during nomination. This is why=
,
> for instance, we run DTLS with RFC4571 framing over tcp candidates, not
> TLS. Because of this I always thought that ICE is UDP first with addition=
al
> TCP transports for situation when UDP will not work. So, as a result, I
> think ICE-bis should specify that UDP MUST be supported and default
> candidate MUST be UDP. ICE SDP can reflect this, but I think this is the
> underlying protocol requirement.
>
> I also wanted to add that BFCP needs to examine how ICE support is
> implemented by this protocol. I think it is not covered in the current
> drafts. I also think I do not think it is possible for TCP/BFCP to run ov=
er
> ICE. On the other hand UDP/DTLS/BFCP and TCP/DTLS/BFCP would trivial base=
d
> on current DTLS work.
>
> Regards,
> _____________
> Roman Shpount
>
> On Wed, Nov 16, 2016 at 8:44 PM, Christer Holmberg <
> christer.holmberg@ericsson.com> wrote:
>
>> I have no problem with Roman=E2=80=99s must-support-UDP suggestion. I gu=
ess the
>> question is whether the BFCP folks could accept that. Cullen did say tha=
t
>> TCP-based BFCP deployments have been around for a decade. But, do they
>> support ICE?
>>
>>
>>
>> If we decide to move forward with such approach, we need to ask ourselve=
s
>> whether must-support-UDP should be an ICE requirement (in which case the
>> suggestion should be brought to the ICE WG) or whether it should only be=
 an
>> ICE-using-SIP-SDP requirement.
>>
>>
>>
>> Regards,
>>
>>
>>
>> Christer
>>
>>
>>
>> *From:* mmusic [mailto:mmusic-bounces@ietf.org] *On Behalf Of *Roman
>> Shpount
>> *Sent:* 17 November 2016 00:52
>> *To:* mmusic@ietf.org
>> *Subject:* [MMUSIC] m=3D line protocol in case of ICE
>>
>>
>>
>> Hi All,
>>
>>
>>
>> I just wanted to return to the m=3D line protocol issue that Christer
>> raised during the last MMUSIC session.
>>
>>
>>
>> All the ICE implementations I've seen are primarily UDP based with
>> support for tcp host candidates which are primarily used to connect to e=
nd
>> points on public IP. If all ICE implementations are continue to be
>> primarily UDP based, then the simplest solution would be to require UDP
>> support when any given protocol is implemented over ICE. DTLS and RTP ar=
e
>> already primarily UDP based so this is a non-requirement. Even more, all
>> protocols that are implemented on top of ICE must assume that underling
>> transports (including tcp candidates) are unreliable, since candidate pa=
ir
>> can change at any time between reliable and unreliable transports, so th=
is
>> makes them different from protocols implemented on plain TCP or TLS.
>>
>>
>>
>> So the first question I wanted to ask is anybody interested in TCP only
>> ICE implementation where the protocol running on top of such implementat=
ion
>> relies on the reliable delivery of underlying messages? By this I mean,
>> does anybody wants implement TCP based ICE, with simultaneous open,
>> reflexive and relay candidates in such a way that ICE implementation wil=
l
>> run from behind NAT without ever needing a UDP candidate?
>>
>>
>>
>> I understand that BFCP was used for a long time, but I do not think
>> TCP/BFCP or TCP/TLS/BFCP can even be used with ICE. I think only UDP/BFC=
P,
>> UDP/DTLS/BFCP and TCP/DTLS/BFCP can even support ICE.
>>
>>
>>
>> I think both rfc4582bis and rfc4583bis need a careful review and
>> additional sections that describe ICE considerations. I think the most
>> obvious thing would be to specify that ICE can only be supported by
>> UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP. It will also mean in which ca=
se
>> RFC4571 is used when tcp candidates are used. Furthermore, when tcp
>> candidate is selected with UDP/BFCP transport, it is not the same thing =
as
>> using TCP/BFCP and will need a different transport tag (something like
>> TCP/UDP/BFCP). Alternatively we can require that only secure versions of
>> BFCP are used with ICE and only allow ICE usage for UDP/DTLS/BFCP and
>> TCP/DTLS/BFCP.
>>
>>
>>
>> To conclude, I would argue that the simplest solution would be that for
>> all protocols implemented on top of ICE, UDP MUST be supported and defau=
lt
>> candidates MUST be UDP based. This avoids building uncomfortable artific=
ial
>> constructs to avoid ICE mismatch and requires minimal changes to existin=
g
>> specifications.
>>
>>
>>
>> Regards,
>>
>> _____________
>> Roman Shpount
>>
>
> _______________________________________________
> mmusic mailing list
> mmusic@ietf.org
> https://www.ietf.org/mailman/listinfo/mmusic
>
>
>

--94eb2c05c7ca8b226c054189da93
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi All,</div><div><br></div>There are three comments =
I wanted to make regarding general nature of all existing protocols designe=
d to work ICE<div><br></div><div>1. Protocols running on top of ICE assume =
that regardless what candidate pair is used, including tcp candidates, the =
underlying network transport is unordered and unreliable. During nomination=
, including continuous nomination, candidate pairs can switch, including sw=
itching from udp to tcp or from tcp to udp. This typically means that proto=
col re-transmit timers are operational, packets are re-ordered at the proto=
col level, and =C2=A0UDP-friendly packet sizes are used even when packets a=
re sent over tcp candidates. For instance DTLS and SCTP re-transmit timers,=
 reordering, and fragmentation support are still running when tcp candidate=
s are used.</div><div><br></div><div>2. Protocols do not assume that partic=
ular candidate network transport runs all the way from origination to final=
 destination of the protocol packets. For instance there are SBC which only=
 handle ICE. These SBC run the ICE state machine and then transmit the unde=
rlying protocol data to the final destination using public IP. Because of t=
his, it is not unusual for RTP to run over tcp candidate until SBC and then=
 run over UDP to the final destination. This is one more reason why re-tran=
smit timers and other mechanisms used to deal with UDP are still running ov=
er tcp candidates.</div><div><br></div><div>3. I am not aware of any curren=
t protocol running over ICE tcp candidates which is not using RFC4571 frami=
ng. For instance DTLS could have been implemented using DTLS protocol frami=
ng without RFC4571 over tcp candidates, but this was not the case. This is =
partially done to simplify implementation of SBC which terminate ICE and tr=
ansmit protocol data using UDP. By using RFC 4571 framing, SBC can packetiz=
e/de-packetize data transmitted over tcp candidates without knowing protoco=
l details.</div><div><br></div><div>To conclude, up until this point ICE tc=
p candidates were not treated as reliable transport and served simply as an=
other way to transmit UDP packets through firewalls. Because of this, I wou=
ld argue that BFCP running over tcp candidate is not the same as TCP/BFCP, =
in the same way as DTLS running over tcp candidate is not TLS.</div><div><b=
r></div><div>I would also argue that any protocol running over ICE is, in e=
ssence, a UDP based protocol, using tcp candidates only as a fall back mech=
anism for firewall traversal, same way as when data is relayed over TURN TC=
P, it is still considered sent over UDP at the protocol level.</div><div><b=
r></div><div>If ICE group agrees, I think this should be documented by sayi=
ng that UDP is a MUST implement for any protocol using ICE and that default=
 candidate should be UDP based.</div><div><br></div><div>Regards,<div class=
=3D"gmail_extra"><div><div class=3D"gmail_signature">_____________<br>Roman=
 Shpount</div></div>
<br><div class=3D"gmail_quote">On Thu, Nov 17, 2016 at 8:14 PM, Alan Ford <=
span dir=3D"ltr">&lt;<a href=3D"mailto:alan.ford@gmail.com" target=3D"_blan=
k">alan.ford@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,=
204);padding-left:1ex"><div style=3D"word-wrap:break-word">Adding bfcpbis.<=
div><br></div><div>You raise a good point Roman - there=E2=80=99s no defini=
tion of how to actually use ICE with BFCP at the protocol level - this only=
 came up in some very late reviews of 4582bis. The initial suggestion was t=
o use the same text as in=C2=A0draft-ietf-mmusic-sctp-sdp-<wbr>19, but it t=
hen raised the point that, given BFCP does not have a MTI protocol, if the =
offerer supported both they would include their preferred option, but if th=
e receiver supported the other variant, there=E2=80=99s no way to immediate=
ly negotiate that without a re-INVITE.</div><div><br></div><div>Christer=E2=
=80=99s suggestion to relax the requirement that the m-line protocol <i>in =
the answer</i>=C2=A0matches one of the ICE candidates would support the cas=
e where the offerer supports both but prefers UDP, but the answerer only su=
pports TCP. Although no implementations currently do ICE here, this relaxat=
ion would leave the door open to gaining this negotiation flexibility in bf=
cpbis implementations. There seems no reason to have this requirement appli=
ed to the answer in the first place.</div><div><br></div><div>I don=E2=80=
=99t understand the comment about SBCs; today, tcp candidates are used for =
media and data channels end-to-end in WebRTC, to name but one implementatio=
n.</div><div><br></div><div>Regards,</div><div>Alan</div><div><br></div><di=
v><div><blockquote type=3D"cite"><div><div class=3D"gmail-h5"><div>On 17 No=
v 2016, at 03:05, Roman Shpount &lt;<a href=3D"mailto:roman@telurix.com" ta=
rget=3D"_blank">roman@telurix.com</a>&gt; wrote:</div><br class=3D"gmail-m_=
2018491490878955934Apple-interchange-newline"></div></div><div><div><div cl=
ass=3D"gmail-h5"><div dir=3D"ltr"><div>Adding ICE group to this message.</d=
iv><div><br></div>The approach always was that tcp candidates can potential=
ly go only as far as SBC and then be terminated by UDP transport. Because o=
f this everything transmitted over tcp candidate was still considered to be=
 transmitted over the unreliable out-of-order transport. It is also assumed=
 that candidates can switch from UDP to TCP based candidate during nominati=
on. This is why, for instance, we run DTLS with RFC4571 framing over tcp ca=
ndidates, not TLS. Because of this I always thought that ICE is UDP first w=
ith additional TCP transports for situation when UDP will not work. So, as =
a result, I think ICE-bis should specify that UDP MUST be supported and def=
ault candidate MUST be UDP. ICE SDP can reflect this, but I think this is t=
he underlying protocol requirement.<div><br></div><div>I also wanted to add=
 that BFCP needs to examine how ICE support is implemented by this protocol=
. I think it is not covered in the current drafts. I also think I do not th=
ink it is possible for TCP/BFCP to=C2=A0run over ICE. On the other hand UDP=
/DTLS/BFCP and TCP/DTLS/BFCP would trivial based on current DTLS work.<br><=
div><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">Regards=
,<br clear=3D"all"><div><div class=3D"gmail-m_2018491490878955934gmail_sign=
ature">_____________<br>Roman Shpount</div></div>
<br><div class=3D"gmail_quote">On Wed, Nov 16, 2016 at 8:44 PM, Christer Ho=
lmberg <span dir=3D"ltr">&lt;<a href=3D"mailto:christer.holmberg@ericsson.c=
om" target=3D"_blank">christer.holmberg@ericsson.<wbr>com</a>&gt;</span> wr=
ote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-GB">
<div class=3D"gmail-m_2018491490878955934gmail-m_4315692423899779813WordSec=
tion1"><p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-fami=
ly:calibri,sans-serif;font-size:11pt">I have no problem with Roman=E2=80=99=
s must-support-UDP suggestion. I guess the question is whether the BFCP fol=
ks could accept that. Cullen
 did say that TCP-based BFCP deployments have been around for a decade. But=
, do they support ICE?</span><br></p><p class=3D"MsoNormal"><span style=3D"=
font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,125)"><u></u>=
=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11p=
t;font-family:calibri,sans-serif;color:rgb(31,73,125)">If we decide to move=
 forward with such approach, we need to ask ourselves whether must-support-=
UDP should be an ICE requirement (in
 which case the suggestion should be brought to the ICE WG) or whether it s=
hould only be an ICE-using-SIP-SDP requirement.
<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11=
pt;font-family:calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u=
></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-famil=
y:calibri,sans-serif;color:rgb(31,73,125)">Regards,<u></u><u></u></span></p=
><p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:calibri,s=
ans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p><p class=3D"=
MsoNormal"><span style=3D"font-size:11pt;font-family:calibri,sans-serif;col=
or:rgb(31,73,125)">Christer<u></u><u></u></span></p><p class=3D"MsoNormal">=
<a name=3D"m_2018491490878955934_m_4315692423899779813__MailEndCompose"><sp=
an style=3D"font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,1=
25)"><u></u>=C2=A0<u></u></span></a></p><p class=3D"MsoNormal"><b><span lan=
g=3D"EN-US" style=3D"font-size:11pt;font-family:calibri,sans-serif">From:</=
span></b><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:calibri,s=
ans-serif"> mmusic [mailto:<a href=3D"mailto:mmusic-bounces@ietf.org" targe=
t=3D"_blank">mmusic-bounces@ietf.or<wbr>g</a>]
<b>On Behalf Of </b>Roman Shpount<br>
<b>Sent:</b> 17 November 2016 00:52<br>
<b>To:</b> <a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf=
.org</a><br>
<b>Subject:</b> [MMUSIC] m=3D line protocol in case of ICE<u></u><u></u></s=
pan></p><div><div class=3D"gmail-m_2018491490878955934gmail-h5"><p class=3D=
"MsoNormal"><u></u>=C2=A0<u></u></p>
<div><p class=3D"MsoNormal">Hi All,<u></u><u></u></p>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">I just wanted to return to the m=3D line protoc=
ol issue that Christer raised during the last MMUSIC session.<u></u><u></u>=
</p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">All the ICE implementations I&#39;ve seen are p=
rimarily UDP based with support for tcp host candidates which are primarily=
 used to connect to end points on public IP. If all ICE implementations are=
 continue to be primarily UDP based, then the
 simplest solution would be to require UDP support when any given protocol =
is implemented over ICE. DTLS and RTP are already primarily UDP based so th=
is is a non-requirement. Even more, all protocols that are implemented on t=
op of ICE must assume that underling
 transports (including tcp candidates) are unreliable, since candidate pair=
 can change at any time between reliable and unreliable transports, so this=
 makes them different from protocols implemented on plain TCP or TLS.<u></u=
><u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">So the first question I wanted to ask is anybod=
y interested in TCP only ICE implementation where the protocol running on t=
op of such implementation relies on the reliable delivery of underlying mes=
sages? By this I mean, does anybody wants
 implement TCP based ICE, with simultaneous open, reflexive and relay candi=
dates in such a way that ICE implementation will run from behind NAT withou=
t ever needing a UDP candidate?<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">I understand that BFCP was used for a long time=
, but I do not think TCP/BFCP or TCP/TLS/BFCP can even be used with ICE. I =
think only UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP can even support ICE.=
=C2=A0<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">I think both=C2=A0rfc4582bis and rfc4583bis nee=
d a careful review and additional sections that describe ICE considerations=
. I think the most obvious thing would be to specify that ICE can only be s=
upported by UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP.
 It will also mean in which case RFC4571 is used when tcp candidates are us=
ed. Furthermore, when tcp candidate is selected with UDP/BFCP transport, it=
 is not the same thing as using TCP/BFCP and will need a different transpor=
t tag (something like TCP/UDP/BFCP).
 Alternatively we can require that only secure versions of BFCP are used wi=
th ICE and only allow ICE usage for UDP/DTLS/BFCP and TCP/DTLS/BFCP.<u></u>=
<u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">To conclude, I would argue that the simplest so=
lution would be that for all protocols implemented on top of ICE, UDP MUST =
be supported and default candidates MUST be UDP based. This avoids building=
 uncomfortable artificial constructs to
 avoid ICE mismatch and requires minimal changes to existing specifications=
.<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<div>
<div><p class=3D"MsoNormal">_____________<br>
Roman Shpount<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div></div></div>
</div>

</blockquote></div><br></div></div></div></div></div></div><span class=3D"g=
mail-">
______________________________<wbr>_________________<br>mmusic mailing list=
<br><a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.org</a=
><br><a href=3D"https://www.ietf.org/mailman/listinfo/mmusic" target=3D"_bl=
ank">https://www.ietf.org/mailman/<wbr>listinfo/mmusic</a><br></span></div>=
</blockquote></div><br></div></div></blockquote></div><br></div></div></div=
>

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "bfcpbis@ietf.org" <bfcpbis@ietf.org>
Thread-Topic: Do we want to mandate all protocols supporting ICE and multiple transports to support transport switch on-the-fly before nomination?
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Subject: [bfcpbis] FW: Do we want to mandate all protocols supporting ICE and multiple transports to support transport switch on-the-fly before nomination?
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Forwarding to bfcpbis, as this is very much related to BFCP. If you have co=
mments, please bring those to the ICE WG list, so we get everything in one =
place :)

Regards,

Christer

From: Ice [mailto:ice-bounces@ietf.org] On Behalf Of Christer Holmberg
Sent: 19 November 2016 11:27
To: ice@ietf.org
Subject: [Ice] Do we want to mandate all protocols supporting ICE and multi=
ple transports to support transport switch on-the-fly before nomination?

Hi,

One potential issue that came to my mind while reading the SDP m- line thre=
ad.

Previously, before removal of aggressive nomination, while and endpoint mig=
ht support both UDP and TCP for a protocol, it didn't have to be able to si=
multaneously use the protocol with both UDP and TCP, and switching between.=
 Because, until nomination was done, no protocol data was sent. And, once n=
omination had been done, endpoints used the protocol with the selected tran=
sport.

Now, with the allowed-to-send-media-before-nomination rules, protocols basi=
cally have to support switch of transport (from UDP to TCP, and vice versa)=
, until the nomination takes place.

Now, even people always say that a good designed protocol should be transpo=
rt-independent, isn't *mandating* transport switching on-the-fly (before no=
mination takes place) by all protocols supporting ICE and multiple transpor=
ts a bad thing to do?

Perhaps the ICE considerations of each protocol (RTP, BFCP etc) should indi=
cate whether transport switching is supported, and whether there are protoc=
ol specific procedures associated with that. I guess a protocol could also =
specify that data shouldn't be sent in the first place before nomination ha=
s been done, if there are good reasons for that.

Regards,

Christer

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Forwarding to bfcpbis,=
 as this is very much related to BFCP. If you have comments, please bring t=
hose to the ICE WG list, so we get everything in one place :)<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Christer<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><a name=3D"_MailEndCompose"><span style=3D"color:#1F=
497D"><o:p>&nbsp;</o:p></span></a></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"mso-fareast-languag=
e:EN-GB">From:</span></b><span lang=3D"EN-US" style=3D"mso-fareast-language=
:EN-GB"> Ice [mailto:ice-bounces@ietf.org]
<b>On Behalf Of </b>Christer Holmberg<br>
<b>Sent:</b> 19 November 2016 11:27<br>
<b>To:</b> ice@ietf.org<br>
<b>Subject:</b> [Ice] Do we want to mandate all protocols supporting ICE an=
d multiple transports to support transport switch on-the-fly before nominat=
ion?<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">One potential issue that came to my mind while readi=
ng the SDP m- line thread.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Previously, before removal of aggressive nomination,=
 while and endpoint might support both UDP and TCP for a protocol, it didn&=
#8217;t have to be able to simultaneously use the protocol with both UDP an=
d TCP, and switching between. Because, until
 nomination was done, no protocol data was sent. And, once nomination had b=
een done, endpoints used the protocol with the selected transport.<o:p></o:=
p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Now, with the allowed-to-send-media-before-nominatio=
n rules, protocols basically have to support switch of transport (from UDP =
to TCP, and vice versa), until the nomination takes place.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Now, even people always say that a good designed pro=
tocol should be transport-independent, isn&#8217;t *<b>mandating</b>* trans=
port switching on-the-fly (before nomination takes place) by all protocols =
supporting ICE and multiple transports a
 bad thing to do?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Perhaps the ICE considerations of each protocol (RTP=
, BFCP etc) should indicate whether transport switching is supported, and w=
hether there are protocol specific procedures associated with that. I guess=
 a protocol could also specify that
 data shouldn&#8217;t be sent in the first place before nomination has been=
 done, if there are good reasons for that.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Christer<o:p></o:p></p>
</div>
</body>
</html>

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From: Roman Shpount <roman@telurix.com>
Date: Sun, 20 Nov 2016 18:23:26 -0500
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To: Alan Ford <alan.ford@gmail.com>
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Cc: bfcpbis@ietf.org, ice@ietf.org, "mmusic@ietf.org" <mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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Hi All,

I just wanted to add to my previous email, that according to RFC
6544 protocols running over tcp candidates MUST use  RFC 4571 framing (
https://tools.ietf.org/html/rfc6544#section-10.1). This means that BFCP
running over tcp candidate is not TCP/BFCP and will require a different
transport tag.

Regards,

_____________
Roman Shpount

On Thu, Nov 17, 2016 at 9:13 PM, Roman Shpount <roman@telurix.com> wrote:

> Hi All,
>
> There are three comments I wanted to make regarding general nature of all
> existing protocols designed to work ICE
>
> 1. Protocols running on top of ICE assume that regardless what candidate
> pair is used, including tcp candidates, the underlying network transport =
is
> unordered and unreliable. During nomination, including continuous
> nomination, candidate pairs can switch, including switching from udp to t=
cp
> or from tcp to udp. This typically means that protocol re-transmit timers
> are operational, packets are re-ordered at the protocol level, and
>  UDP-friendly packet sizes are used even when packets are sent over tcp
> candidates. For instance DTLS and SCTP re-transmit timers, reordering, an=
d
> fragmentation support are still running when tcp candidates are used.
>
> 2. Protocols do not assume that particular candidate network transport
> runs all the way from origination to final destination of the protocol
> packets. For instance there are SBC which only handle ICE. These SBC run
> the ICE state machine and then transmit the underlying protocol data to t=
he
> final destination using public IP. Because of this, it is not unusual for
> RTP to run over tcp candidate until SBC and then run over UDP to the fina=
l
> destination. This is one more reason why re-transmit timers and other
> mechanisms used to deal with UDP are still running over tcp candidates.
>
> 3. I am not aware of any current protocol running over ICE tcp candidates
> which is not using RFC4571 framing. For instance DTLS could have been
> implemented using DTLS protocol framing without RFC4571 over tcp
> candidates, but this was not the case. This is partially done to simplify
> implementation of SBC which terminate ICE and transmit protocol data usin=
g
> UDP. By using RFC 4571 framing, SBC can packetize/de-packetize data
> transmitted over tcp candidates without knowing protocol details.
>
> To conclude, up until this point ICE tcp candidates were not treated as
> reliable transport and served simply as another way to transmit UDP packe=
ts
> through firewalls. Because of this, I would argue that BFCP running over
> tcp candidate is not the same as TCP/BFCP, in the same way as DTLS runnin=
g
> over tcp candidate is not TLS.
>
> I would also argue that any protocol running over ICE is, in essence, a
> UDP based protocol, using tcp candidates only as a fall back mechanism fo=
r
> firewall traversal, same way as when data is relayed over TURN TCP, it is
> still considered sent over UDP at the protocol level.
>
> If ICE group agrees, I think this should be documented by saying that UDP
> is a MUST implement for any protocol using ICE and that default candidate
> should be UDP based.
>
> Regards,
> _____________
> Roman Shpount
>
> On Thu, Nov 17, 2016 at 8:14 PM, Alan Ford <alan.ford@gmail.com> wrote:
>
>> Adding bfcpbis.
>>
>> You raise a good point Roman - there=E2=80=99s no definition of how to a=
ctually
>> use ICE with BFCP at the protocol level - this only came up in some very
>> late reviews of 4582bis. The initial suggestion was to use the same text=
 as
>> in draft-ietf-mmusic-sctp-sdp-19, but it then raised the point that,
>> given BFCP does not have a MTI protocol, if the offerer supported both t=
hey
>> would include their preferred option, but if the receiver supported the
>> other variant, there=E2=80=99s no way to immediately negotiate that with=
out a
>> re-INVITE.
>>
>> Christer=E2=80=99s suggestion to relax the requirement that the m-line p=
rotocol *in
>> the answer* matches one of the ICE candidates would support the case
>> where the offerer supports both but prefers UDP, but the answerer only
>> supports TCP. Although no implementations currently do ICE here, this
>> relaxation would leave the door open to gaining this negotiation
>> flexibility in bfcpbis implementations. There seems no reason to have th=
is
>> requirement applied to the answer in the first place.
>>
>> I don=E2=80=99t understand the comment about SBCs; today, tcp candidates=
 are used
>> for media and data channels end-to-end in WebRTC, to name but one
>> implementation.
>>
>> Regards,
>> Alan
>>
>> On 17 Nov 2016, at 03:05, Roman Shpount <roman@telurix.com> wrote:
>>
>> Adding ICE group to this message.
>>
>> The approach always was that tcp candidates can potentially go only as
>> far as SBC and then be terminated by UDP transport. Because of this
>> everything transmitted over tcp candidate was still considered to be
>> transmitted over the unreliable out-of-order transport. It is also assum=
ed
>> that candidates can switch from UDP to TCP based candidate during
>> nomination. This is why, for instance, we run DTLS with RFC4571 framing
>> over tcp candidates, not TLS. Because of this I always thought that ICE =
is
>> UDP first with additional TCP transports for situation when UDP will not
>> work. So, as a result, I think ICE-bis should specify that UDP MUST be
>> supported and default candidate MUST be UDP. ICE SDP can reflect this, b=
ut
>> I think this is the underlying protocol requirement.
>>
>> I also wanted to add that BFCP needs to examine how ICE support is
>> implemented by this protocol. I think it is not covered in the current
>> drafts. I also think I do not think it is possible for TCP/BFCP to run o=
ver
>> ICE. On the other hand UDP/DTLS/BFCP and TCP/DTLS/BFCP would trivial bas=
ed
>> on current DTLS work.
>>
>> Regards,
>> _____________
>> Roman Shpount
>>
>> On Wed, Nov 16, 2016 at 8:44 PM, Christer Holmberg <
>> christer.holmberg@ericsson.com> wrote:
>>
>>> I have no problem with Roman=E2=80=99s must-support-UDP suggestion. I g=
uess the
>>> question is whether the BFCP folks could accept that. Cullen did say th=
at
>>> TCP-based BFCP deployments have been around for a decade. But, do they
>>> support ICE?
>>>
>>>
>>>
>>> If we decide to move forward with such approach, we need to ask
>>> ourselves whether must-support-UDP should be an ICE requirement (in whi=
ch
>>> case the suggestion should be brought to the ICE WG) or whether it shou=
ld
>>> only be an ICE-using-SIP-SDP requirement.
>>>
>>>
>>>
>>> Regards,
>>>
>>>
>>>
>>> Christer
>>>
>>>
>>>
>>> *From:* mmusic [mailto:mmusic-bounces@ietf.org] *On Behalf Of *Roman
>>> Shpount
>>> *Sent:* 17 November 2016 00:52
>>> *To:* mmusic@ietf.org
>>> *Subject:* [MMUSIC] m=3D line protocol in case of ICE
>>>
>>>
>>>
>>> Hi All,
>>>
>>>
>>>
>>> I just wanted to return to the m=3D line protocol issue that Christer
>>> raised during the last MMUSIC session.
>>>
>>>
>>>
>>> All the ICE implementations I've seen are primarily UDP based with
>>> support for tcp host candidates which are primarily used to connect to =
end
>>> points on public IP. If all ICE implementations are continue to be
>>> primarily UDP based, then the simplest solution would be to require UDP
>>> support when any given protocol is implemented over ICE. DTLS and RTP a=
re
>>> already primarily UDP based so this is a non-requirement. Even more, al=
l
>>> protocols that are implemented on top of ICE must assume that underling
>>> transports (including tcp candidates) are unreliable, since candidate p=
air
>>> can change at any time between reliable and unreliable transports, so t=
his
>>> makes them different from protocols implemented on plain TCP or TLS.
>>>
>>>
>>>
>>> So the first question I wanted to ask is anybody interested in TCP only
>>> ICE implementation where the protocol running on top of such implementa=
tion
>>> relies on the reliable delivery of underlying messages? By this I mean,
>>> does anybody wants implement TCP based ICE, with simultaneous open,
>>> reflexive and relay candidates in such a way that ICE implementation wi=
ll
>>> run from behind NAT without ever needing a UDP candidate?
>>>
>>>
>>>
>>> I understand that BFCP was used for a long time, but I do not think
>>> TCP/BFCP or TCP/TLS/BFCP can even be used with ICE. I think only UDP/BF=
CP,
>>> UDP/DTLS/BFCP and TCP/DTLS/BFCP can even support ICE.
>>>
>>>
>>>
>>> I think both rfc4582bis and rfc4583bis need a careful review and
>>> additional sections that describe ICE considerations. I think the most
>>> obvious thing would be to specify that ICE can only be supported by
>>> UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP. It will also mean in which c=
ase
>>> RFC4571 is used when tcp candidates are used. Furthermore, when tcp
>>> candidate is selected with UDP/BFCP transport, it is not the same thing=
 as
>>> using TCP/BFCP and will need a different transport tag (something like
>>> TCP/UDP/BFCP). Alternatively we can require that only secure versions o=
f
>>> BFCP are used with ICE and only allow ICE usage for UDP/DTLS/BFCP and
>>> TCP/DTLS/BFCP.
>>>
>>>
>>>
>>> To conclude, I would argue that the simplest solution would be that for
>>> all protocols implemented on top of ICE, UDP MUST be supported and defa=
ult
>>> candidates MUST be UDP based. This avoids building uncomfortable artifi=
cial
>>> constructs to avoid ICE mismatch and requires minimal changes to existi=
ng
>>> specifications.
>>>
>>>
>>>
>>> Regards,
>>>
>>> _____________
>>> Roman Shpount
>>>
>>
>> _______________________________________________
>> mmusic mailing list
>> mmusic@ietf.org
>> https://www.ietf.org/mailman/listinfo/mmusic
>>
>>
>>
>

--001a11404b3290a43e0541c3d344
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi All,<div><br></div><div>I just wanted to add to my prev=
ious email, that according to RFC 6544=C2=A0protocols running over tcp cand=
idates MUST use =C2=A0RFC 4571 framing (<a href=3D"https://tools.ietf.org/h=
tml/rfc6544#section-10.1">https://tools.ietf.org/html/rfc6544#section-10.1<=
/a>). This means that BFCP running over tcp candidate is not TCP/BFCP and w=
ill require a different transport tag.</div><div><br></div><div>Regards,</d=
iv></div><div class=3D"gmail_extra"><br clear=3D"all"><div><div class=3D"gm=
ail_signature" data-smartmail=3D"gmail_signature">_____________<br>Roman Sh=
pount</div></div>
<br><div class=3D"gmail_quote">On Thu, Nov 17, 2016 at 9:13 PM, Roman Shpou=
nt <span dir=3D"ltr">&lt;<a href=3D"mailto:roman@telurix.com" target=3D"_bl=
ank">roman@telurix.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex"><div dir=3D"ltr"><div>Hi All,</div><div><br></div>There are three comme=
nts I wanted to make regarding general nature of all existing protocols des=
igned to work ICE<div><br></div><div>1. Protocols running on top of ICE ass=
ume that regardless what candidate pair is used, including tcp candidates, =
the underlying network transport is unordered and unreliable. During nomina=
tion, including continuous nomination, candidate pairs can switch, includin=
g switching from udp to tcp or from tcp to udp. This typically means that p=
rotocol re-transmit timers are operational, packets are re-ordered at the p=
rotocol level, and =C2=A0UDP-friendly packet sizes are used even when packe=
ts are sent over tcp candidates. For instance DTLS and SCTP re-transmit tim=
ers, reordering, and fragmentation support are still running when tcp candi=
dates are used.</div><div><br></div><div>2. Protocols do not assume that pa=
rticular candidate network transport runs all the way from origination to f=
inal destination of the protocol packets. For instance there are SBC which =
only handle ICE. These SBC run the ICE state machine and then transmit the =
underlying protocol data to the final destination using public IP. Because =
of this, it is not unusual for RTP to run over tcp candidate until SBC and =
then run over UDP to the final destination. This is one more reason why re-=
transmit timers and other mechanisms used to deal with UDP are still runnin=
g over tcp candidates.</div><div><br></div><div>3. I am not aware of any cu=
rrent protocol running over ICE tcp candidates which is not using RFC4571 f=
raming. For instance DTLS could have been implemented using DTLS protocol f=
raming without RFC4571 over tcp candidates, but this was not the case. This=
 is partially done to simplify implementation of SBC which terminate ICE an=
d transmit protocol data using UDP. By using RFC 4571 framing, SBC can pack=
etize/de-packetize data transmitted over tcp candidates without knowing pro=
tocol details.</div><div><br></div><div>To conclude, up until this point IC=
E tcp candidates were not treated as reliable transport and served simply a=
s another way to transmit UDP packets through firewalls. Because of this, I=
 would argue that BFCP running over tcp candidate is not the same as TCP/BF=
CP, in the same way as DTLS running over tcp candidate is not TLS.</div><di=
v><br></div><div>I would also argue that any protocol running over ICE is, =
in essence, a UDP based protocol, using tcp candidates only as a fall back =
mechanism for firewall traversal, same way as when data is relayed over TUR=
N TCP, it is still considered sent over UDP at the protocol level.</div><di=
v><br></div><div>If ICE group agrees, I think this should be documented by =
saying that UDP is a MUST implement for any protocol using ICE and that def=
ault candidate should be UDP based.</div><div><br></div><div>Regards,<div c=
lass=3D"gmail_extra"><div><div class=3D"m_-6168704694884856451gmail_signatu=
re">_____________<span class=3D"HOEnZb"><font color=3D"#888888"><br>Roman S=
hpount</font></span></div></div><div><div class=3D"h5">
<br><div class=3D"gmail_quote">On Thu, Nov 17, 2016 at 8:14 PM, Alan Ford <=
span dir=3D"ltr">&lt;<a href=3D"mailto:alan.ford@gmail.com" target=3D"_blan=
k">alan.ford@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,=
204);padding-left:1ex"><div style=3D"word-wrap:break-word">Adding bfcpbis.<=
div><br></div><div>You raise a good point Roman - there=E2=80=99s no defini=
tion of how to actually use ICE with BFCP at the protocol level - this only=
 came up in some very late reviews of 4582bis. The initial suggestion was t=
o use the same text as in=C2=A0draft-ietf-mmusic-sctp-sdp-<wbr>19, but it t=
hen raised the point that, given BFCP does not have a MTI protocol, if the =
offerer supported both they would include their preferred option, but if th=
e receiver supported the other variant, there=E2=80=99s no way to immediate=
ly negotiate that without a re-INVITE.</div><div><br></div><div>Christer=E2=
=80=99s suggestion to relax the requirement that the m-line protocol <i>in =
the answer</i>=C2=A0matches one of the ICE candidates would support the cas=
e where the offerer supports both but prefers UDP, but the answerer only su=
pports TCP. Although no implementations currently do ICE here, this relaxat=
ion would leave the door open to gaining this negotiation flexibility in bf=
cpbis implementations. There seems no reason to have this requirement appli=
ed to the answer in the first place.</div><div><br></div><div>I don=E2=80=
=99t understand the comment about SBCs; today, tcp candidates are used for =
media and data channels end-to-end in WebRTC, to name but one implementatio=
n.</div><div><br></div><div>Regards,</div><div>Alan</div><div><br></div><di=
v><div><blockquote type=3D"cite"><div><div class=3D"m_-6168704694884856451g=
mail-h5"><div>On 17 Nov 2016, at 03:05, Roman Shpount &lt;<a href=3D"mailto=
:roman@telurix.com" target=3D"_blank">roman@telurix.com</a>&gt; wrote:</div=
><br class=3D"m_-6168704694884856451gmail-m_2018491490878955934Apple-interc=
hange-newline"></div></div><div><div><div class=3D"m_-6168704694884856451gm=
ail-h5"><div dir=3D"ltr"><div>Adding ICE group to this message.</div><div><=
br></div>The approach always was that tcp candidates can potentially go onl=
y as far as SBC and then be terminated by UDP transport. Because of this ev=
erything transmitted over tcp candidate was still considered to be transmit=
ted over the unreliable out-of-order transport. It is also assumed that can=
didates can switch from UDP to TCP based candidate during nomination. This =
is why, for instance, we run DTLS with RFC4571 framing over tcp candidates,=
 not TLS. Because of this I always thought that ICE is UDP first with addit=
ional TCP transports for situation when UDP will not work. So, as a result,=
 I think ICE-bis should specify that UDP MUST be supported and default cand=
idate MUST be UDP. ICE SDP can reflect this, but I think this is the underl=
ying protocol requirement.<div><br></div><div>I also wanted to add that BFC=
P needs to examine how ICE support is implemented by this protocol. I think=
 it is not covered in the current drafts. I also think I do not think it is=
 possible for TCP/BFCP to=C2=A0run over ICE. On the other hand UDP/DTLS/BFC=
P and TCP/DTLS/BFCP would trivial based on current DTLS work.<br><div><div =
class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">Regards,<br clea=
r=3D"all"><div><div class=3D"m_-6168704694884856451gmail-m_2018491490878955=
934gmail_signature">_____________<br>Roman Shpount</div></div>
<br><div class=3D"gmail_quote">On Wed, Nov 16, 2016 at 8:44 PM, Christer Ho=
lmberg <span dir=3D"ltr">&lt;<a href=3D"mailto:christer.holmberg@ericsson.c=
om" target=3D"_blank">christer.holmberg@ericsson.co<wbr>m</a>&gt;</span> wr=
ote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-GB">
<div class=3D"m_-6168704694884856451gmail-m_2018491490878955934gmail-m_4315=
692423899779813WordSection1"><p class=3D"MsoNormal"><span style=3D"color:rg=
b(31,73,125);font-family:calibri,sans-serif;font-size:11pt">I have no probl=
em with Roman=E2=80=99s must-support-UDP suggestion. I guess the question i=
s whether the BFCP folks could accept that. Cullen
 did say that TCP-based BFCP deployments have been around for a decade. But=
, do they support ICE?</span><br></p><p class=3D"MsoNormal"><span style=3D"=
font-size:11pt;font-family:calibri,sans-serif;color:rgb(31,73,125)"><u></u>=
=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11p=
t;font-family:calibri,sans-serif;color:rgb(31,73,125)">If we decide to move=
 forward with such approach, we need to ask ourselves whether must-support-=
UDP should be an ICE requirement (in
 which case the suggestion should be brought to the ICE WG) or whether it s=
hould only be an ICE-using-SIP-SDP requirement.
<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11=
pt;font-family:calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u=
></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-famil=
y:calibri,sans-serif;color:rgb(31,73,125)">Regards,<u></u><u></u></span></p=
><p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:calibri,s=
ans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p><p class=3D"=
MsoNormal"><span style=3D"font-size:11pt;font-family:calibri,sans-serif;col=
or:rgb(31,73,125)">Christer<u></u><u></u></span></p><p class=3D"MsoNormal">=
<a name=3D"m_-6168704694884856451_m_2018491490878955934_m_43156924238997798=
13__MailEndCompose"><span style=3D"font-size:11pt;font-family:calibri,sans-=
serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></a></p><p class=3D"=
MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:cali=
bri,sans-serif">From:</span></b><span lang=3D"EN-US" style=3D"font-size:11p=
t;font-family:calibri,sans-serif"> mmusic [mailto:<a href=3D"mailto:mmusic-=
bounces@ietf.org" target=3D"_blank">mmusic-bounces@ietf.or<wbr>g</a>]
<b>On Behalf Of </b>Roman Shpount<br>
<b>Sent:</b> 17 November 2016 00:52<br>
<b>To:</b> <a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf=
.org</a><br>
<b>Subject:</b> [MMUSIC] m=3D line protocol in case of ICE<u></u><u></u></s=
pan></p><div><div class=3D"m_-6168704694884856451gmail-m_201849149087895593=
4gmail-h5"><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div><p class=3D"MsoNormal">Hi All,<u></u><u></u></p>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">I just wanted to return to the m=3D line protoc=
ol issue that Christer raised during the last MMUSIC session.<u></u><u></u>=
</p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">All the ICE implementations I&#39;ve seen are p=
rimarily UDP based with support for tcp host candidates which are primarily=
 used to connect to end points on public IP. If all ICE implementations are=
 continue to be primarily UDP based, then the
 simplest solution would be to require UDP support when any given protocol =
is implemented over ICE. DTLS and RTP are already primarily UDP based so th=
is is a non-requirement. Even more, all protocols that are implemented on t=
op of ICE must assume that underling
 transports (including tcp candidates) are unreliable, since candidate pair=
 can change at any time between reliable and unreliable transports, so this=
 makes them different from protocols implemented on plain TCP or TLS.<u></u=
><u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">So the first question I wanted to ask is anybod=
y interested in TCP only ICE implementation where the protocol running on t=
op of such implementation relies on the reliable delivery of underlying mes=
sages? By this I mean, does anybody wants
 implement TCP based ICE, with simultaneous open, reflexive and relay candi=
dates in such a way that ICE implementation will run from behind NAT withou=
t ever needing a UDP candidate?<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">I understand that BFCP was used for a long time=
, but I do not think TCP/BFCP or TCP/TLS/BFCP can even be used with ICE. I =
think only UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP can even support ICE.=
=C2=A0<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">I think both=C2=A0rfc4582bis and rfc4583bis nee=
d a careful review and additional sections that describe ICE considerations=
. I think the most obvious thing would be to specify that ICE can only be s=
upported by UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP.
 It will also mean in which case RFC4571 is used when tcp candidates are us=
ed. Furthermore, when tcp candidate is selected with UDP/BFCP transport, it=
 is not the same thing as using TCP/BFCP and will need a different transpor=
t tag (something like TCP/UDP/BFCP).
 Alternatively we can require that only secure versions of BFCP are used wi=
th ICE and only allow ICE usage for UDP/DTLS/BFCP and TCP/DTLS/BFCP.<u></u>=
<u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">To conclude, I would argue that the simplest so=
lution would be that for all protocols implemented on top of ICE, UDP MUST =
be supported and default candidates MUST be UDP based. This avoids building=
 uncomfortable artificial constructs to
 avoid ICE mismatch and requires minimal changes to existing specifications=
.<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div><p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<div>
<div><p class=3D"MsoNormal">_____________<br>
Roman Shpount<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div></div></div>
</div>

</blockquote></div><br></div></div></div></div></div></div><span class=3D"m=
_-6168704694884856451gmail-">
______________________________<wbr>_________________<br>mmusic mailing list=
<br><a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.org</a=
><br><a href=3D"https://www.ietf.org/mailman/listinfo/mmusic" target=3D"_bl=
ank">https://www.ietf.org/mailman/l<wbr>istinfo/mmusic</a><br></span></div>=
</blockquote></div><br></div></div></blockquote></div><br></div></div></div=
></div></div>
</blockquote></div><br></div>

--001a11404b3290a43e0541c3d344--


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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Mon, 21 Nov 2016 00:27:46 +0100
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Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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2016-11-21 0:23 GMT+01:00 Roman Shpount <roman@telurix.com>:
> I just wanted to add to my previous email, that according to RFC 6544
> protocols running over tcp candidates MUST use  RFC 4571 framing
> (https://tools.ietf.org/html/rfc6544#section-10.1). This means that BFCP
> running over tcp candidate is not TCP/BFCP and will require a different
> transport tag.

IMHO the exact transport is just "ICE". ICE itself is a "virtual
transport" that can use many "real transports" (UDP, TCP+RFC4571,
etc).

So ICE/BFCP would be my way to go.


--=20
I=C3=B1aki Baz Castillo
<ibc@aliax.net>


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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>, Alan Ford <alan.ford@gmail.com>
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--_000_7594FB04B1934943A5C02806D1A2204B4BE823C9ESESSMB209erics_--


From nobody Mon Nov 21 01:28:11 2016
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: =?utf-8?B?ScOxYWtpIEJheiBDYXN0aWxsbw==?= <ibc@aliax.net>, Roman Shpount <roman@telurix.com>
Thread-Topic: [MMUSIC] m= line protocol in case of ICE
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Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Mon, 21 Nov 2016 16:38:42 +0100
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Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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2016-11-21 10:27 GMT+01:00 Christer Holmberg <christer.holmberg@ericsson.co=
m>:
> This has been discussed before: the procedures have to be backward compat=
ible with non-ICE endpoints.

I'd rather deprecate non-ICE endpoints.


--=20
I=C3=B1aki Baz Castillo
<ibc@aliax.net>


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From: Roman Shpount <roman@telurix.com>
Date: Tue, 22 Nov 2016 15:43:30 -0500
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To: Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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Christer,

I think this is another way around -- BFCP would have to use RFC 4571
framing when using tcp candidates.

There is deployed equipment (SBC) that rely on the fact that RFC 4571
framing is used by tcp candidates in ICE. I am not sure there are ICE
implementations of BFCP. I think new implementation should be updated to
comply with existing standards, not another way around.

Can someone provide some insight regarding BFCP with UDP and ICE
implementation? Are there implementations of either? I see the RFC for
TCP/BFCP, but it looks like UDP/BFCP and BFCP with ICE only exist in drafts=
.

My proposal either to limit ICE support to UDP/DTLS/BFCP and TCP/DTLS/BFCP,
or define new transport tag DBFCP (datagram BFCP), and define ICE support
for UDP/DBFCP and TCP/DBFCP, where UDP version of BFCP is used over udp and
tcp ICE candidates, with  RFC 4571 framing used in case of tcp candidates.

If this is done, we can make UDP/DTLS/BFCP MUST implement if ICE is
supported for encrypted (and UDP/DBFCP for non-encrypted), make default
candidate UDP, and all the ICE problems disappear.

Not sure about the current state of MSRP and ICE, but I do not think there
are any implementations of it. Probably the best way to implement it now
would be over datachannel or quick.

Regards,

_____________
Roman Shpount

On Mon, Nov 21, 2016 at 4:25 AM, Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

> Hi Roman,
>
>
>
> Good catch.
>
>
>
> That basically means that bfcpbis would have to document the usage of
> framing for BFCP-TCP =E2=80=93 assuming they want BFCP-TCP to work with I=
CE.
>
>
>
> I assume the same applies to MSRP (when not using an MSRP relay).
>
>
>
> Regards,
>
>
>
> Christer
>
>
>
>
>
> *From:* Roman Shpount [mailto:roman@telurix.com]
> *Sent:* 21 November 2016 01:23
> *To:* Alan Ford <alan.ford@gmail.com>
> *Cc:* Christer Holmberg <christer.holmberg@ericsson.com>; mmusic@ietf.org=
;
> ice@ietf.org; bfcpbis@ietf.org
> *Subject:* Re: [MMUSIC] m=3D line protocol in case of ICE
>
>
>
> Hi All,
>
>
>
> I just wanted to add to my previous email, that according to RFC
> 6544 protocols running over tcp candidates MUST use  RFC 4571 framing (
> https://tools.ietf.org/html/rfc6544#section-10.1). This means that BFCP
> running over tcp candidate is not TCP/BFCP and will require a different
> transport tag.
>
>
>
> Regards,
>
>
> _____________
> Roman Shpount
>
>
>
> On Thu, Nov 17, 2016 at 9:13 PM, Roman Shpount <roman@telurix.com> wrote:
>
> Hi All,
>
>
>
> There are three comments I wanted to make regarding general nature of all
> existing protocols designed to work ICE
>
>
>
> 1. Protocols running on top of ICE assume that regardless what candidate
> pair is used, including tcp candidates, the underlying network transport =
is
> unordered and unreliable. During nomination, including continuous
> nomination, candidate pairs can switch, including switching from udp to t=
cp
> or from tcp to udp. This typically means that protocol re-transmit timers
> are operational, packets are re-ordered at the protocol level, and
>  UDP-friendly packet sizes are used even when packets are sent over tcp
> candidates. For instance DTLS and SCTP re-transmit timers, reordering, an=
d
> fragmentation support are still running when tcp candidates are used.
>
>
>
> 2. Protocols do not assume that particular candidate network transport
> runs all the way from origination to final destination of the protocol
> packets. For instance there are SBC which only handle ICE. These SBC run
> the ICE state machine and then transmit the underlying protocol data to t=
he
> final destination using public IP. Because of this, it is not unusual for
> RTP to run over tcp candidate until SBC and then run over UDP to the fina=
l
> destination. This is one more reason why re-transmit timers and other
> mechanisms used to deal with UDP are still running over tcp candidates.
>
>
>
> 3. I am not aware of any current protocol running over ICE tcp candidates
> which is not using RFC4571 framing. For instance DTLS could have been
> implemented using DTLS protocol framing without RFC4571 over tcp
> candidates, but this was not the case. This is partially done to simplify
> implementation of SBC which terminate ICE and transmit protocol data usin=
g
> UDP. By using RFC 4571 framing, SBC can packetize/de-packetize data
> transmitted over tcp candidates without knowing protocol details.
>
>
>
> To conclude, up until this point ICE tcp candidates were not treated as
> reliable transport and served simply as another way to transmit UDP packe=
ts
> through firewalls. Because of this, I would argue that BFCP running over
> tcp candidate is not the same as TCP/BFCP, in the same way as DTLS runnin=
g
> over tcp candidate is not TLS.
>
>
>
> I would also argue that any protocol running over ICE is, in essence, a
> UDP based protocol, using tcp candidates only as a fall back mechanism fo=
r
> firewall traversal, same way as when data is relayed over TURN TCP, it is
> still considered sent over UDP at the protocol level.
>
>
>
> If ICE group agrees, I think this should be documented by saying that UDP
> is a MUST implement for any protocol using ICE and that default candidate
> should be UDP based.
>
>
>
> Regards,
>
> _____________
> Roman Shpount
>
>
>
> On Thu, Nov 17, 2016 at 8:14 PM, Alan Ford <alan.ford@gmail.com> wrote:
>
> Adding bfcpbis.
>
>
>
> You raise a good point Roman - there=E2=80=99s no definition of how to ac=
tually
> use ICE with BFCP at the protocol level - this only came up in some very
> late reviews of 4582bis. The initial suggestion was to use the same text =
as
> in draft-ietf-mmusic-sctp-sdp-19, but it then raised the point that,
> given BFCP does not have a MTI protocol, if the offerer supported both th=
ey
> would include their preferred option, but if the receiver supported the
> other variant, there=E2=80=99s no way to immediately negotiate that witho=
ut a
> re-INVITE.
>
>
>
> Christer=E2=80=99s suggestion to relax the requirement that the m-line pr=
otocol *in
> the answer* matches one of the ICE candidates would support the case
> where the offerer supports both but prefers UDP, but the answerer only
> supports TCP. Although no implementations currently do ICE here, this
> relaxation would leave the door open to gaining this negotiation
> flexibility in bfcpbis implementations. There seems no reason to have thi=
s
> requirement applied to the answer in the first place.
>
>
>
> I don=E2=80=99t understand the comment about SBCs; today, tcp candidates =
are used
> for media and data channels end-to-end in WebRTC, to name but one
> implementation.
>
>
>
> Regards,
>
> Alan
>
>
>
> On 17 Nov 2016, at 03:05, Roman Shpount <roman@telurix.com> wrote:
>
>
>
> Adding ICE group to this message.
>
>
>
> The approach always was that tcp candidates can potentially go only as fa=
r
> as SBC and then be terminated by UDP transport. Because of this everythin=
g
> transmitted over tcp candidate was still considered to be transmitted ove=
r
> the unreliable out-of-order transport. It is also assumed that candidates
> can switch from UDP to TCP based candidate during nomination. This is why=
,
> for instance, we run DTLS with RFC4571 framing over tcp candidates, not
> TLS. Because of this I always thought that ICE is UDP first with addition=
al
> TCP transports for situation when UDP will not work. So, as a result, I
> think ICE-bis should specify that UDP MUST be supported and default
> candidate MUST be UDP. ICE SDP can reflect this, but I think this is the
> underlying protocol requirement.
>
>
>
> I also wanted to add that BFCP needs to examine how ICE support is
> implemented by this protocol. I think it is not covered in the current
> drafts. I also think I do not think it is possible for TCP/BFCP to run ov=
er
> ICE. On the other hand UDP/DTLS/BFCP and TCP/DTLS/BFCP would trivial base=
d
> on current DTLS work.
>
>
>
> Regards,
>
> _____________
> Roman Shpount
>
>
>
> On Wed, Nov 16, 2016 at 8:44 PM, Christer Holmberg <
> christer.holmberg@ericsson.com> wrote:
>
> I have no problem with Roman=E2=80=99s must-support-UDP suggestion. I gue=
ss the
> question is whether the BFCP folks could accept that. Cullen did say that
> TCP-based BFCP deployments have been around for a decade. But, do they
> support ICE?
>
>
>
> If we decide to move forward with such approach, we need to ask ourselves
> whether must-support-UDP should be an ICE requirement (in which case the
> suggestion should be brought to the ICE WG) or whether it should only be =
an
> ICE-using-SIP-SDP requirement.
>
>
>
> Regards,
>
>
>
> Christer
>
>
>
> *From:* mmusic [mailto:mmusic-bounces@ietf.org] *On Behalf Of *Roman
> Shpount
> *Sent:* 17 November 2016 00:52
> *To:* mmusic@ietf.org
> *Subject:* [MMUSIC] m=3D line protocol in case of ICE
>
>
>
> Hi All,
>
>
>
> I just wanted to return to the m=3D line protocol issue that Christer rai=
sed
> during the last MMUSIC session.
>
>
>
> All the ICE implementations I've seen are primarily UDP based with suppor=
t
> for tcp host candidates which are primarily used to connect to end points
> on public IP. If all ICE implementations are continue to be primarily UDP
> based, then the simplest solution would be to require UDP support when an=
y
> given protocol is implemented over ICE. DTLS and RTP are already primaril=
y
> UDP based so this is a non-requirement. Even more, all protocols that are
> implemented on top of ICE must assume that underling transports (includin=
g
> tcp candidates) are unreliable, since candidate pair can change at any ti=
me
> between reliable and unreliable transports, so this makes them different
> from protocols implemented on plain TCP or TLS.
>
>
>
> So the first question I wanted to ask is anybody interested in TCP only
> ICE implementation where the protocol running on top of such implementati=
on
> relies on the reliable delivery of underlying messages? By this I mean,
> does anybody wants implement TCP based ICE, with simultaneous open,
> reflexive and relay candidates in such a way that ICE implementation will
> run from behind NAT without ever needing a UDP candidate?
>
>
>
> I understand that BFCP was used for a long time, but I do not think
> TCP/BFCP or TCP/TLS/BFCP can even be used with ICE. I think only UDP/BFCP=
,
> UDP/DTLS/BFCP and TCP/DTLS/BFCP can even support ICE.
>
>
>
> I think both rfc4582bis and rfc4583bis need a careful review and
> additional sections that describe ICE considerations. I think the most
> obvious thing would be to specify that ICE can only be supported by
> UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP. It will also mean in which cas=
e
> RFC4571 is used when tcp candidates are used. Furthermore, when tcp
> candidate is selected with UDP/BFCP transport, it is not the same thing a=
s
> using TCP/BFCP and will need a different transport tag (something like
> TCP/UDP/BFCP). Alternatively we can require that only secure versions of
> BFCP are used with ICE and only allow ICE usage for UDP/DTLS/BFCP and
> TCP/DTLS/BFCP.
>
>
>
> To conclude, I would argue that the simplest solution would be that for
> all protocols implemented on top of ICE, UDP MUST be supported and defaul=
t
> candidates MUST be UDP based. This avoids building uncomfortable artifici=
al
> constructs to avoid ICE mismatch and requires minimal changes to existing
> specifications.
>
>
>
> Regards,
>
> _____________
> Roman Shpount
>
>
>
> _______________________________________________
> mmusic mailing list
> mmusic@ietf.org
> https://www.ietf.org/mailman/listinfo/mmusic
>
>
>
>
>
>
>

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Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Christer,<div><br></div><div>I think this is another way a=
round -- BFCP would have to use RFC 4571 framing when using tcp candidates.=
</div><div><br></div><div>There is deployed equipment (SBC) that rely on th=
e fact that RFC 4571 framing is used by tcp candidates in ICE. I am not sur=
e there are ICE implementations of BFCP. I think new implementation should =
be updated to comply with existing standards, not another way around.</div>=
<div><br></div><div>Can someone provide some insight regarding BFCP with UD=
P and ICE implementation? Are there implementations of either? I see the RF=
C for TCP/BFCP, but it looks like UDP/BFCP and BFCP with ICE only exist in =
drafts.</div><div><br></div><div>My proposal either to limit ICE support to=
 UDP/DTLS/BFCP and TCP/DTLS/BFCP, or define new transport tag DBFCP (datagr=
am BFCP), and define ICE support for UDP/DBFCP and TCP/DBFCP, where UDP ver=
sion of BFCP is used over udp and tcp ICE candidates, with =C2=A0RFC 4571 f=
raming used in case of tcp candidates.</div><div><br></div><div>If this is =
done, we can make UDP/DTLS/BFCP MUST implement if ICE is supported for encr=
ypted (and UDP/DBFCP for non-encrypted), make default candidate UDP, and=C2=
=A0all the ICE problems disappear.=C2=A0</div><div><br></div><div>Not sure =
about the current state of MSRP and ICE, but I do not think there are any i=
mplementations of it. Probably the best way to implement it now would be ov=
er datachannel or quick.</div><div><br></div><div>Regards,</div></div><div =
class=3D"gmail_extra"><br clear=3D"all"><div><div class=3D"gmail_signature"=
 data-smartmail=3D"gmail_signature">_____________<br>Roman Shpount</div></d=
iv>
<br><div class=3D"gmail_quote">On Mon, Nov 21, 2016 at 4:25 AM, Christer Ho=
lmberg <span dir=3D"ltr">&lt;<a href=3D"mailto:christer.holmberg@ericsson.c=
om" target=3D"_blank">christer.holmberg@ericsson.com</a>&gt;</span> wrote:<=
br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-GB" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-3461873552890462393WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Hi Roman,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Good catch.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">That basically means that bfcpbis wou=
ld have to document the usage of framing for BFCP-TCP =E2=80=93 assuming th=
ey want BFCP-TCP to work with
 ICE.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">I assume the same applies to MSRP (wh=
en not using an MSRP relay).
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Regards,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Christer<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><a name=3D"m_-3461873552890462393__MailEndCompose"><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;c=
olor:#1f497d"><u></u>=C2=A0<u></u></span></a></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span lang=3D"EN-=
US" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> =
Roman Shpount [mailto:<a href=3D"mailto:roman@telurix.com" target=3D"_blank=
">roman@telurix.com</a>]
<br>
<b>Sent:</b> 21 November 2016 01:23<br>
<b>To:</b> Alan Ford &lt;<a href=3D"mailto:alan.ford@gmail.com" target=3D"_=
blank">alan.ford@gmail.com</a>&gt;<br>
<b>Cc:</b> Christer Holmberg &lt;<a href=3D"mailto:christer.holmberg@ericss=
on.com" target=3D"_blank">christer.holmberg@ericsson.<wbr>com</a>&gt;; <a h=
ref=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.org</a>; <a hr=
ef=3D"mailto:ice@ietf.org" target=3D"_blank">ice@ietf.org</a>; <a href=3D"m=
ailto:bfcpbis@ietf.org" target=3D"_blank">bfcpbis@ietf.org</a><br>
<b>Subject:</b> Re: [MMUSIC] m=3D line protocol in case of ICE<u></u><u></u=
></span></p><div><div class=3D"h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi All,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I just wanted to add to my previous email, that acco=
rding to RFC 6544=C2=A0protocols running over tcp candidates MUST use =C2=
=A0RFC 4571 framing (<a href=3D"https://tools.ietf.org/html/rfc6544#section=
-10.1" target=3D"_blank">https://tools.ietf.org/html/<wbr>rfc6544#section-1=
0.1</a>).
 This means that BFCP running over tcp candidate is not TCP/BFCP and will r=
equire a different transport tag.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><br clear=3D"all">
<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal">_____________<br>
Roman Shpount<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Thu, Nov 17, 2016 at 9:13 PM, Roman Shpount &lt;<=
a href=3D"mailto:roman@telurix.com" target=3D"_blank">roman@telurix.com</a>=
&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal">Hi All,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal">There are three comments I wanted to make regarding =
general nature of all existing protocols designed to work ICE<u></u><u></u>=
</p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">1. Protocols running on top of ICE assume that regar=
dless what candidate pair is used, including tcp candidates, the underlying=
 network transport is unordered and unreliable. During nomination, includin=
g continuous nomination, candidate
 pairs can switch, including switching from udp to tcp or from tcp to udp. =
This typically means that protocol re-transmit timers are operational, pack=
ets are re-ordered at the protocol level, and =C2=A0UDP-friendly packet siz=
es are used even when packets are sent
 over tcp candidates. For instance DTLS and SCTP re-transmit timers, reorde=
ring, and fragmentation support are still running when tcp candidates are u=
sed.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">2. Protocols do not assume that particular candidate=
 network transport runs all the way from origination to final destination o=
f the protocol packets. For instance there are SBC which only handle ICE. T=
hese SBC run the ICE state machine
 and then transmit the underlying protocol data to the final destination us=
ing public IP. Because of this, it is not unusual for RTP to run over tcp c=
andidate until SBC and then run over UDP to the final destination. This is =
one more reason why re-transmit
 timers and other mechanisms used to deal with UDP are still running over t=
cp candidates.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">3. I am not aware of any current protocol running ov=
er ICE tcp candidates which is not using RFC4571 framing. For instance DTLS=
 could have been implemented using DTLS protocol framing without RFC4571 ov=
er tcp candidates, but this was not
 the case. This is partially done to simplify implementation of SBC which t=
erminate ICE and transmit protocol data using UDP. By using RFC 4571 framin=
g, SBC can packetize/de-packetize data transmitted over tcp candidates with=
out knowing protocol details.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">To conclude, up until this point ICE tcp candidates =
were not treated as reliable transport and served simply as another way to =
transmit UDP packets through firewalls. Because of this, I would argue that=
 BFCP running over tcp candidate is
 not the same as TCP/BFCP, in the same way as DTLS running over tcp candida=
te is not TLS.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I would also argue that any protocol running over IC=
E is, in essence, a UDP based protocol, using tcp candidates only as a fall=
 back mechanism for firewall traversal, same way as when data is relayed ov=
er TURN TCP, it is still considered
 sent over UDP at the protocol level.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">If ICE group agrees, I think this should be document=
ed by saying that UDP is a MUST implement for any protocol using ICE and th=
at default candidate should be UDP based.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
<div>
<div>
<div>
<p class=3D"MsoNormal">_____________<span style=3D"color:#888888"><br>
<span class=3D"m_-3461873552890462393hoenzb">Roman Shpount</span></span><u>=
</u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Thu, Nov 17, 2016 at 8:14 PM, Alan Ford &lt;<a hr=
ef=3D"mailto:alan.ford@gmail.com" target=3D"_blank">alan.ford@gmail.com</a>=
&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<p class=3D"MsoNormal">Adding bfcpbis.<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">You raise a good point Roman - there=E2=80=99s no de=
finition of how to actually use ICE with BFCP at the protocol level - this =
only came up in some very late reviews of 4582bis. The initial suggestion w=
as to use the same text as in=C2=A0draft-ietf-mmusic-sctp-sdp-<wbr>19,
 but it then raised the point that, given BFCP does not have a MTI protocol=
, if the offerer supported both they would include their preferred option, =
but if the receiver supported the other variant, there=E2=80=99s no way to =
immediately negotiate that without a re-INVITE.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Christer=E2=80=99s suggestion to relax the requireme=
nt that the m-line protocol
<i>in the answer</i>=C2=A0matches one of the ICE candidates would support t=
he case where the offerer supports both but prefers UDP, but the answerer o=
nly supports TCP. Although no implementations currently do ICE here, this r=
elaxation would leave the door open to
 gaining this negotiation flexibility in bfcpbis implementations. There see=
ms no reason to have this requirement applied to the answer in the first pl=
ace.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I don=E2=80=99t understand the comment about SBCs; t=
oday, tcp candidates are used for media and data channels end-to-end in Web=
RTC, to name but one implementation.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Alan<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class=3D"MsoNormal">On 17 Nov 2016, at 03:05, Roman Shpount &lt;<a href=
=3D"mailto:roman@telurix.com" target=3D"_blank">roman@telurix.com</a>&gt; w=
rote:<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal">Adding ICE group to this message.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal">The approach always was that tcp candidates can pote=
ntially go only as far as SBC and then be terminated by UDP transport. Beca=
use of this everything transmitted over tcp candidate was still considered =
to be transmitted over the unreliable
 out-of-order transport. It is also assumed that candidates can switch from=
 UDP to TCP based candidate during nomination. This is why, for instance, w=
e run DTLS with RFC4571 framing over tcp candidates, not TLS. Because of th=
is I always thought that ICE is
 UDP first with additional TCP transports for situation when UDP will not w=
ork. So, as a result, I think ICE-bis should specify that UDP MUST be suppo=
rted and default candidate MUST be UDP. ICE SDP can reflect this, but I thi=
nk this is the underlying protocol
 requirement.<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I also wanted to add that BFCP needs to examine how =
ICE support is implemented by this protocol. I think it is not covered in t=
he current drafts. I also think I do not think it is possible for TCP/BFCP =
to=C2=A0run over ICE. On the other hand
 UDP/DTLS/BFCP and TCP/DTLS/BFCP would trivial based on current DTLS work.<=
u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<br clear=3D"all">
<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal">_____________<br>
Roman Shpount<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Wed, Nov 16, 2016 at 8:44 PM, Christer Holmberg &=
lt;<a href=3D"mailto:christer.holmberg@ericsson.com" target=3D"_blank">chri=
ster.holmberg@ericsson.<wbr>com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">I have no problem with Roman=E2=80=99=
s must-support-UDP suggestion. I guess the question is whether the BFCP
 folks could accept that. Cullen did say that TCP-based BFCP deployments ha=
ve been around for a decade. But, do they support ICE?</span><u></u><u></u>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">If we decide to move forward with suc=
h approach, we need to ask ourselves whether must-support-UDP
 should be an ICE requirement (in which case the suggestion should be broug=
ht to the ICE WG) or whether it should only be an ICE-using-SIP-SDP require=
ment.
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Regards,</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Christer</span><u></u><u></u></p>
<p class=3D"MsoNormal"><a name=3D"m_-3461873552890462393_m_-616870469488485=
6451_m_201849149087895"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1f497d">=C2=A0</span></a><u></u><u></u></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span lang=3D"EN-=
US" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> =
mmusic
 [mailto:<a href=3D"mailto:mmusic-bounces@ietf.org" target=3D"_blank">mmusi=
c-bounces@ietf.<wbr>org</a>]
<b>On Behalf Of </b>Roman Shpount<br>
<b>Sent:</b> 17 November 2016 00:52<br>
<b>To:</b> <a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf=
.org</a><br>
<b>Subject:</b> [MMUSIC] m=3D line protocol in case of ICE</span><u></u><u>=
</u></p>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">Hi All,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I just wanted to return to the m=3D line protocol is=
sue that Christer raised during the last MMUSIC session.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">All the ICE implementations I&#39;ve seen are primar=
ily UDP based with support for tcp host candidates which are primarily used=
 to connect to end points on public IP. If all ICE implementations
 are continue to be primarily UDP based, then the simplest solution would b=
e to require UDP support when any given protocol is implemented over ICE. D=
TLS and RTP are already primarily UDP based so this is a non-requirement. E=
ven more, all protocols that are
 implemented on top of ICE must assume that underling transports (including=
 tcp candidates) are unreliable, since candidate pair can change at any tim=
e between reliable and unreliable transports, so this makes them different =
from protocols implemented on plain
 TCP or TLS.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">So the first question I wanted to ask is anybody int=
erested in TCP only ICE implementation where the protocol running on top of=
 such implementation relies on the reliable delivery
 of underlying messages? By this I mean, does anybody wants implement TCP b=
ased ICE, with simultaneous open, reflexive and relay candidates in such a =
way that ICE implementation will run from behind NAT without ever needing a=
 UDP candidate?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I understand that BFCP was used for a long time, but=
 I do not think TCP/BFCP or TCP/TLS/BFCP can even be used with ICE. I think=
 only UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP can
 even support ICE.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I think both=C2=A0rfc4582bis and rfc4583bis need a c=
areful review and additional sections that describe ICE considerations. I t=
hink the most obvious thing would be to specify that ICE
 can only be supported by UDP/BFCP, UDP/DTLS/BFCP and TCP/DTLS/BFCP. It wil=
l also mean in which case RFC4571 is used when tcp candidates are used. Fur=
thermore, when tcp candidate is selected with UDP/BFCP transport, it is not=
 the same thing as using TCP/BFCP
 and will need a different transport tag (something like TCP/UDP/BFCP). Alt=
ernatively we can require that only secure versions of BFCP are used with I=
CE and only allow ICE usage for UDP/DTLS/BFCP and TCP/DTLS/BFCP.<u></u><u><=
/u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">To conclude, I would argue that the simplest solutio=
n would be that for all protocols implemented on top of ICE, UDP MUST be su=
pported and default candidates MUST be UDP based.
 This avoids building uncomfortable artificial constructs to avoid ICE mism=
atch and requires minimal changes to existing specifications.<u></u><u></u>=
</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal">_____________<br>
Roman Shpount<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal"><span class=3D"m_-3461873552890462393m-6168704694884=
856451gmail-">______________________________<wbr>_________________</span><b=
r>
<span class=3D"m_-3461873552890462393m-6168704694884856451gmail-">mmusic ma=
iling list</span><br>
<span class=3D"m_-3461873552890462393m-6168704694884856451gmail-"><a href=
=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.org</a></span><br=
>
<span class=3D"m_-3461873552890462393m-6168704694884856451gmail-"><a href=
=3D"https://www.ietf.org/mailman/listinfo/mmusic" target=3D"_blank">https:/=
/www.ietf.org/mailman/<wbr>listinfo/mmusic</a></span><u></u><u></u></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div></div>
</div>

</blockquote></div><br></div>

--001a113ce4763a35620541e9d344--


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2016-11-22 21:43 GMT+01:00 Roman Shpount <roman@telurix.com>:
> Can someone provide some insight regarding BFCP with UDP and ICE
> implementation? Are there implementations of either?

I bet there is no one implementation. In fact, I implemented "JSFCP"
(JSON version of BFCP) over WebSocket.

> Not sure about the current state of MSRP and ICE, but I do not think ther=
e
> are any implementations of it.

Of course not. And the fact that there are MSRP relays (by spec) makes
it even more difficult to move to more efficient solutions such as
"anything" over UDP/ICE/DTLS/SCTP or similar.




--=20
I=C3=B1aki Baz Castillo
<ibc@aliax.net>


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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: =?iso-8859-1?Q?I=F1aki_Baz_Castillo?= <ibc@aliax.net>, Roman Shpount <roman@telurix.com>
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Date: Wed, 23 Nov 2016 05:16:05 +0000
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Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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Hi,

>> Not sure about the current state of MSRP and ICE, but I do not think
>>there
>> are any implementations of it.
>
>Of course not. And the fact that there are MSRP relays (by spec) makes
>it even more difficult to move to more efficient solutions such as
>"anything" over UDP/ICE/DTLS/SCTP or similar.

The deployments I am aware of don=B9t use relays. Anyway, *IF* someone want=
s
to define ICE support for MSRP, he/she can =B3write a draft=B2 :)

Regards,

Christer


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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Wed, 23 Nov 2016 10:58:15 +0100
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To: Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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2016-11-23 6:16 GMT+01:00 Christer Holmberg <christer.holmberg@ericsson.com=
>:
>>Of course not. And the fact that there are MSRP relays (by spec) makes
>>it even more difficult to move to more efficient solutions such as
>>"anything" over UDP/ICE/DTLS/SCTP or similar.
>
> The deployments I am aware of don=C2=B9t use relays.

Yep. I'm pretty sure those deployments don't use Outbound/GRUU (RFC
5626/5627) nor MSRP relay servers (RFC 4976). Probably they all use
their own private SIP extensions to handle TCP based connections and
probably they implement middle-boxes that prevent SIP body encryption
(draft-ietf-simple-msrp-sessmatch) because those magic middle-boxes
need to mangle the SDP for things to work in walled gardens.

However, the IETF is supposed to do stuff for the real Internet, and
there are still good guys building real stuff on top of real Internet
standards:

http://msrprelay.org/




--=20
I=C3=B1aki Baz Castillo
<ibc@aliax.net>


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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>, Paul Kyzivat <pkyzivat@alum.mit.edu>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>
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Date: Tue, 29 Nov 2016 17:56:23 +0000
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From: Roman Shpount <roman@telurix.com>
Date: Tue, 29 Nov 2016 13:38:29 -0500
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Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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On Tue, Nov 29, 2016 at 12:48 PM, Charles Eckel (eckelcu) <eckelcu@cisco.com
> wrote:

> It seems to me that the most straightforward approach would be to mandate
> support for BFCP over UDP when using ICE, use UDP as the default candidate,
> and signal the BFCP m-line as if it is BFCP over UDP. If we can mandate the
> use of DTLS, that would be even better.
>
> Thoughts?
>
>
>

I agree.

The only issue that I still have, if DTLS is not used, what protocol is
used when ICE tcp candidate is selected for transport. Is this TCP/BFCP
(which goes against RFC6544)  or is it UDP/BFCP with RFC4571 framing? If it
is UDP/BFCP with RFC4571 framing, what transport tag should be used in the
re-INVITE which is sent after ICE nomination with only selected candidate?
Should it be TCP/UDP/BFCP or something similar?

Regards,
_____________
Roman Shpount

--001a1149a18c092c8e054274e565
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_extra"><div><div class=3D"gmail_signat=
ure">On Tue, Nov 29, 2016 at 12:48 PM, Charles Eckel (eckelcu) <span dir=3D=
"ltr">&lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D"_blank">eckelcu@ci=
sco.com</a>&gt;</span> wrote:<br></div></div><div class=3D"gmail_quote"><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-lef=
t:1px solid rgb(204,204,204);padding-left:1ex">







<div bgcolor=3D"white" lang=3D"EN-US">
<div class=3D"gmail-m_-1458761468083796600WordSection1">
<p class=3D"MsoNormal">It seems to me that the most straightforward approac=
h would be to mandate support for BFCP over UDP when using ICE, use UDP as =
the default candidate, and signal the BFCP m-line as if it is BFCP over UDP=
. If we can mandate the use of DTLS,
 that would be even better.<u></u><u></u></p>
<p class=3D"MsoNormal">Thoughts?<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0</p></div></div></blockquote><div><br><=
/div><div>I agree.</div><div><br></div><div>The only issue that I still hav=
e, if DTLS is not used, what protocol is used when ICE tcp candidate is=C2=
=A0selected for transport. Is this TCP/BFCP (which goes against RFC6544) =
=C2=A0or is it UDP/BFCP with RFC4571 framing? If it is UDP/BFCP with RFC457=
1 framing, what transport tag should be used in the re-INVITE which is sent=
 after ICE nomination with only selected candidate? Should it be TCP/UDP/BF=
CP or something similar?</div><div><br></div><div>Regards,</div><div><div c=
lass=3D"gmail_signature">_____________<br>Roman Shpount</div></div><div>=C2=
=A0</div></div></div></div>

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
Thread-Topic: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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Date: Tue, 29 Nov 2016 19:31:10 +0000
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Cc: "ice@ietf.org" <ice@ietf.org>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>, Alan Ford <alan.ford@gmail.com>
Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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