Re: [pntaw] TURN over websockets or just TURN.
<Markus.Isomaki@nokia.com> Wed, 25 September 2013 10:23 UTC
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From: Markus.Isomaki@nokia.com
To: andrew.hutton@siemens-enterprise.com, pntaw@ietf.org
Thread-Topic: TURN over websockets or just TURN.
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Date: Wed, 25 Sep 2013 10:19:53 +0000
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Subject: Re: [pntaw] TURN over websockets or just TURN.
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Hi, I completely agree with Andy. The main point is this: > In the presence of an explicit proxy the websockets approach is to use HTTP > CONNECT to traverse the proxy (RFC 6455) So, basically both approaches (to connect to a TURN server via a proxy), with or without WebSockets, use the same initial step. WS to my understanding would just introduce 1) an additional HTTP Upgrade handshake and 2) an additional encapsulation header. I don't think we need 1) because both ends already know that the protocol is TURN. 2) I think is just overhead. Markus > -----Original Message----- > From: pntaw-bounces@ietf.org [mailto:pntaw-bounces@ietf.org] On Behalf > Of ext Hutton, Andrew > Sent: 25 September, 2013 12:59 > To: pntaw@ietf.org > Subject: [pntaw] TURN over websockets or just TURN. > > Some thoughts on comparing the TURN over Websockets approach in draft- > chenxin-behave-turn-websocket and the HTTP Connect (Without > websocket) approach discussed in draft-hutton-rtcweb-nat-firewall- > considerations. > > Please note that my motivation is simply to find a good solution to deploying > WebRTC in the presence of web proxies / firewalls and I am not tied to any > particular solution. > > In the presence of an explicit proxy the websockets approach is to use HTTP > CONNECT to traverse the proxy (RFC 6455) so the question is whether there > are any advantages or disadvantages to wrapping TURN with the websockets > layer as this cannot be about the use of HTTP CONNECT which is used by in > both solutions. > > Websockets adds some overhead as there is an extra handshake that takes > place with the server and there is some extra overhead in the data > encapsulation. > > The purpose of the extra HTTP handshake to upgrade to HTTP to a > websockets connection is to allow an HTTP Server to use the same port for > both HTTP and the websockets protocol. However I don't think this is > necessary for WebRTC media connections as it is very unlikely that a web > server will want to handle WebRTC media/TURN at all never mind on the > HTTP port as the media. > > So does encapsulating the TURN data in websocket frames provide any > benefit. I can imagine that there might be some scenarios in which using a > websockets connection might work when TURN might not simply because > the media is buried in further layers of encapsulation. However I don't know > if this is really the case and also we are of course not trying to hide the fact > that this is media. > > The extra websockets overhead for all the media packets is surely a > drawback of this approach. > > Not encapsulating the TURN in websockets would also probably provide > better control for those wanting to assert policies on the handling of media. > > Therefore as you can see I don't see the benefit of encapsulating TURN in > websockets but I look forward to hearing other opinions and maybe I have > missed something important. > > Regards > Andy > > _______________________________________________ > pntaw mailing list > pntaw@ietf.org > https://www.ietf.org/mailman/listinfo/pntaw
- Re: [pntaw] TURN over websockets or just TURN. Sergio Garcia Murillo
- [pntaw] TURN over websockets or just TURN. Hutton, Andrew
- Re: [pntaw] TURN over websockets or just TURN. Markus.Isomaki
- Re: [pntaw] TURN over websockets or just TURN. Markus.Isomaki
- Re: [pntaw] TURN over websockets or just TURN. Hutton, Andrew
- Re: [pntaw] TURN over websockets or just TURN. Sergio Garcia Murillo
- Re: [pntaw] TURN over websockets or just TURN. Oleg Moskalenko
- Re: [pntaw] TURN over websockets or just TURN. Hutton, Andrew
- Re: [pntaw] TURN over websockets or just TURN. Hutton, Andrew
- Re: [pntaw] TURN over websockets or just TURN. Oleg Moskalenko
- Re: [pntaw] TURN over websockets or just TURN. Hutton, Andrew
- Re: [pntaw] TURN over websockets or just TURN. Oleg Moskalenko
- Re: [pntaw] TURN over websockets or just TURN. Sergio Garcia Murillo
- Re: [pntaw] TURN over websockets or just TURN. Tirumaleswar Reddy (tireddy)
- Re: [pntaw] TURN over websockets or just TURN. Oleg Moskalenko
- Re: [pntaw] TURN over websockets or just TURN. Tirumaleswar Reddy (tireddy)