Re: [Gen-art] Gen-ART review of draft-ietf-rmt-bb-lct-revised-10
"Spencer Dawkins" <spencer@wonderhamster.org> Fri, 07 August 2009 11:54 UTC
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From: Spencer Dawkins <spencer@wonderhamster.org>
To: Michael Luby <luby@qualcomm.com>, Mark Watson <watson@qualcomm.com>, Lorenzo Vicisano <vicisano@qualcomm.com>
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Date: Fri, 07 Aug 2009 06:54:10 -0500
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Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, General Area Review Team <gen-art@ietf.org>, Brian Adamson <adamson@itd.nrl.navy.mil>
Subject: Re: [Gen-art] Gen-ART review of draft-ietf-rmt-bb-lct-revised-10
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This revised draft addresses all of my comments from v09, and has a much stronger Security Considerations section than v09. Ready for publication as Proposed Standard. Thanks, Spencer >I have been selected as the General Area Review Team (Gen-ART) > reviewer for this draft (for background on Gen-ART, please see > http://www.alvestrand.no/ietf/gen/art/gen-art-FAQ.html). > Please resolve these comments along with any other Last Call comments > you may receive. > > Document: draft-ietf-rmt-bb-lct-revised-09 > Reviewer: Spencer Dawkins > Review Date: 2009-04-27 > IETF LC End Date: 2009-04-15 (sorry! "along with any other LATE Last Call > comments...") > IESG Telechat date: (not known) > > Summary: This specification is almost ready for publication as a Proposed > Standard. I have a couple of minor questions (below). I've also included a > small number of nits, but this draft is very clean on that score. > > Comments: > > Abstract > > Layered Coding Transport (LCT) provides transport level support for > reliable content delivery and stream delivery protocols. LCT is > specifically designed to support protocols using IP multicast, but > also provides support to protocols that use unicast. LCT is > compatible with congestion control that provides multiple rate > delivery to receivers and is also compatible with coding techniques > that provide reliable delivery of content. This document obsoletes > RFC3451 > > Spencer (nit): it would be great if the abstract used the word "building > block"... OBTW, there's a missing period after "RFC3451". > > 1. Introduction > > Layered Coding Transport provides transport level support for > > Spencer (nit): it would be good to provide "Layered Coding Transport > (LCT)" somewhere around here - the next section of the document just > starts using the abbreviation with no expansion... > > reliable content delivery and stream delivery protocols. Layered > Coding Transport is specifically designed to support protocols using > IP multicast, but also provides support to protocols that use > unicast. Layered Coding Transport is compatible with congestion > control that provides multiple rate delivery to receivers and is also > compatible with coding techniques that provide reliable delivery of > content. > > RFC3451 [RFC3451], which is obsoleted by this document, contained a > previous versions of the protocol. RFC3451 was published in the > > Spencer (nit): s/versions/version/? but this section of the document > wobbles back and forth between singular ("this document") and plural > ("these specifications") - maybe clear to someone who's followed the > working group for a while, but less clear to me... > > "Experimental" category. It was the stated intent of the RMT working > group to re-submit these specifications as an IETF Proposed Standard > in due course. > > 4. Applicability > > Before joining a session, the receivers MUST obtain enough of the > session description to start the session. This MUST include the > > Spencer (minor): I don't think this two are 2119 MUSTs ... based on the > previous sentence, I'd just s/MUST// the first one completely, but they > should be at least lower-cased... > > relevant session parameters needed by a receiver to participate in > the session, including all information relevant to congestion > control. The session description is determined by the sender, and is > typically communicated to the receivers out-of-band. In some cases, > as described later, parts of the session description that are not > required to initiate a session MAY be included in the LCT header or > communicated to a receiver out-of-band after the receiver has joined > the session. > > 4.1. Environmental Requirements and Considerations > > LCT channels and SSM channels coincide, and thus the receiver will > only receive packets sent to the requested LCT channel. With ASM, > the receiver joins an LCT channel by joining a multicast group G, and > all packets sent to G, regardless of the sender, may be received by > the receiver. Thus, SSM has compelling security advantages over ASM > for prevention of denial of service attacks. In either case, > receivers SHOULD use mechanisms to filter out packets from unwanted > sources. > > Spencer (minor): I'm confused by this. I would have thought that ASM > wasn't so easily filtered in many cases (SSM, sure) - based on the source > address, which could be coming from anywhere? Is this a membership check? > > 8.3. Congestion control issues > > A receiver with an incorrect implementation of a multiple rate > congestion control building block may affect health of the network in > the path between the sender and the receiver, and may also affect the > reception rates of other receivers joined to the session. > > Protocol Instantiations could address this issue by requiring > receivers to identify themselves as legitimate before they receive > the Session Description needed to join the session. > > Spencer (minor): I'm sorry, but I don't understand what's being suggested > here. Could you provide any guidance about how a sender could "identify a > receiver as legitimate"? Is this authentication? If so, what's being > authenticated - an implementation? I may not understand how this would > address the issue of incorrect implementations, either, but let's start > with the first question ;-) > > _______________________________________________ > Gen-art mailing list > Gen-art@ietf.org > https://www.ietf.org/mailman/listinfo/gen-art >
- [Gen-art] Gen-ART review of draft-ietf-rmt-bb-lct… Spencer Dawkins
- Re: [Gen-art] Gen-ART review of draft-ietf-rmt-bb… Watson, Mark
- Re: [Gen-art] Gen-ART review of draft-ietf-rmt-bb… Spencer Dawkins