Re: [Dart] RTP and non-RTP traffic on same UDP 5-tuple
Dan Wing <dwing@cisco.com> Thu, 12 June 2014 00:32 UTC
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From: Dan Wing <dwing@cisco.com>
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Date: Wed, 11 Jun 2014 17:32:19 -0700
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To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Cc: "Black, David" <david.black@emc.com>, "dart@ietf.org" <dart@ietf.org>
Subject: Re: [Dart] RTP and non-RTP traffic on same UDP 5-tuple
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On Jun 11, 2014, at 1:42 PM, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote: > On 11/06/2014 07:59, Black, David wrote: >> In another message, Ruediger Geib asked (>), and I responded: >> >> -------------------- >> >>> Is the following correct: >>> >>> UDP_5-tuple-+--transport protocol 1----- >>> | >>> +--RTP session 1----- >>> | >>> +--RTP session 2-----+---RTP_stream_2.1 >>> | >>> +---RTP_stream_2.2 >>> |... >> >> Yes, that matches my understanding, although the author team would like to >> see discussion of whether it's a good idea to mix RTP and non-RTP protocols >> on the same 5-tuple - I'll copy your useful diagram into a separate message >> to start that discussion. >> >> -------------------- >> >> This is that message, and I want to thank Ruediger for drawing that useful >> diagram. >> >> The author team for draft-york would like input on whether the draft should >> discuss mixing of RTP and non-RTP traffic on the same UDP 5-tuple, vs. using >> separate 5-tuples (probably separate UDP ports) for RTP and non-RTP traffic. > > One observation is that we should be thinking about a 6-tuple these > days (see RFC 6437). I don't think it makes much difference to the argument. > > Another observation is when load balancing is in play, things get a bit > more complicated, but to a first approximation using the same 5-tuple > or 6-tuple will usually ensure that all the packets reach the same > load-balanced destination, which is probably a good thing. > > Third, reverting to the diffserv discussion, the same 5-tuple > should ensure that all the packets would be classified the same > (if they cross a diffserv domain boundary and get reclassified). What do you mean by 'all the packets would be classified the same'? If you mean all the packets in a 5-tuple would get the same differentiated treatment, that is not desirable, because there are lots of folks wanting to send video i-frames or packets with FEC or other stuff with lower drop precedence than other packets. -d > > Brian > >> >> RTCWEB clearly intends to mix SCTP (via DTLS) and RTP traffic on the same >> 5-tuple see the last paragraph of Section 3.5 of draft-ietf-rtcweb-transports-04: >> >> RTCWEB implementations MUST support multiplexing of DTLS and RTP over >> the same port pair, as described in the DTLS_SRTP specification >> [RFC5764], section 5.1.2. All application layer protocol payloads >> over this DTLS connection are SCTP packets. >> >> OTOH, concerns have been expressed about whether the not-exactly-elegant >> demux processing specified in the reference (RFC 5764, Section 5.1.2) ought >> to be recommended as a good way of doing this multiplexing. >> >> Please comment, including whether mixing SCTP and RTP on the same UDP >> 5-tuple is a good idea (some rationale for doing this sort of multiplexing >> onto a single 5-tuple can be found in Section 3 of draft-york-dart-dscp-rtp-00). >> >> Thanks, >> --David >> ---------------------------------------------------- >> David L. Black, Distinguished Engineer >> EMC Corporation, 176 South St., Hopkinton, MA 01748 >> +1 (508) 293-7953 FAX: +1 (508) 293-7786 >> david.black@emc.com Mobile: +1 (978) 394-7754 >> ---------------------------------------------------- >> >> >> _______________________________________________ >> Dart mailing list >> Dart@ietf.org >> https://www.ietf.org/mailman/listinfo/dart >> > > _______________________________________________ > Dart mailing list > Dart@ietf.org > https://www.ietf.org/mailman/listinfo/dart
- [Dart] RTP and non-RTP traffic on same UDP 5-tuple Black, David
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Brian E Carpenter
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Dan Wing
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Black, David
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Brian E Carpenter
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Brian E Carpenter
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Black, David
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Dan Wing
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Dan Wing
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Black, David
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Dan Wing
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Ruediger.Geib
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Harald Alvestrand
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Ruediger.Geib
- [Dart] IPv6 Flow labels? (Re: RTP and non-RTP tra… Harald Alvestrand
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Ben Campbell
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Black, David
- Re: [Dart] IPv6 Flow labels? (Re: RTP and non-RTP… Brian E Carpenter
- Re: [Dart] RTP and non-RTP traffic on same UDP 5-… Brian E Carpenter
- [Dart] Protocols and port numbers (Re: RTP and no… Harald Alvestrand
- Re: [Dart] Protocols and port numbers (Re: RTP an… Brian E Carpenter