Re: [secdir] secdir review of draft-ietf-tsvwg-diffserv-intercon-09
Benjamin Kaduk <kaduk@MIT.EDU> Thu, 22 September 2016 00:42 UTC
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Date: Wed, 21 Sep 2016 20:42:42 -0400
From: Benjamin Kaduk <kaduk@MIT.EDU>
To: "Black, David" <David.Black@dell.com>
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Cc: "iesg@ietf.org" <iesg@ietf.org>, "draft-ietf-tsvwg-diffserv-intercon@ietf.org" <draft-ietf-tsvwg-diffserv-intercon@ietf.org>, "secdir@ietf.org" <secdir@ietf.org>
Subject: Re: [secdir] secdir review of draft-ietf-tsvwg-diffserv-intercon-09
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Hi David, On Wed, 21 Sep 2016, Black, David wrote: > Hi Ben, > > Thanks for the review. > > > However, I do think it's worth giving a little bit of new thought to the > > potential privacy considerations -- a new way of marking traffic, in > > abstract, has the potential to leak classification information about the > > traffic in question (e.g., is this IP address doing telephony?). That > > said, the classification added by this document is something that could be > > done by any party with access to the raw network traffic, so I don't think > > there are actually any new considerations in play; it's just something to > > keep in mind. > > On balance, it seems like a good idea to add a sentence or two to point out > that additional traffic classification information is exposed at network > interconnections by comparison to DSCP remarking to zero - if that traffic > classification info is sensitive, remarking DSCPs to zero to hide the classification > is the countermeasure, at the cost of loss of QoS info and traffic handling > on the interconnect. Thanks. I think the document would be fine without such a sentence, but am happy to see one added. > Also, here are a few comments on your editorial suggestions: > > > Top of page 3, last sentence of first paragraph ("This draft assumes that > > latter approach by defining additional DSCPs that are known and expected > > at network interconnection interfaces.") -- I think maybe "subsumes" is a > > better verb than "assumes", as it is true that unknown/unexpected DSCPs > > are remarked to zero, but there is additional functionality in the > > known/expected DSCPs that are preserved. > > Well, "subsumes" isn't quite right either. Here's a longer rewrite that I hope > makes things clearer: > > OLD > This draft assumes that latter approach by defining additional DSCPs > that are known and expected at network interconnection interfaces. > NEW > This draft is based on the latter approach, and defines additional DSCPs > that are known and expected at network interconnection interfaces in > order to reduce the amount of traffic whose DSCPs are remarked to zero. The transition to "and defines additional" could probably be tweaked a bit more, but this is definitely an improvement -- thanks. > > Across the page 3/page 4 boundary, the part after the semicolon is a > > sentence fragment ... I can't even tell what it's trying to say. Maybe, > > "remarking to zero is performed in the absence of [...]" (but put a comma > > before "for"). > > Yes, it's a fragment - here's a suggested rewrite: > > OLD > remarking in the absence of > additional agreement(s) when the MPLS Short Pipe model is used for > reasons explained in this document. > NEW > use of the MPLS Short Pipe model favors remarking unexpected DSCPs > to zero in the absence of additional agreement(s), as explained further > in this document. Makes sense. > > Section 1.1, first paragraph, is this work really intended to *complement* > > RFC 5160? It seems to me that rather it is building upon 5160, or > > implementing its suggestions, or something like that. > > The activities are independent, so "complement" is a reasonable summary. I'll have to take your word for it, since my understanding seems to be incomplete. Sorry for the noise, then. -Ben
- [secdir] secdir review of draft-ietf-tsvwg-diffse… Benjamin Kaduk
- [secdir] secdir review of draft-ietf-tsvwg-diffse… Benjamin Kaduk
- Re: [secdir] secdir review of draft-ietf-tsvwg-di… Black, David
- Re: [secdir] secdir review of draft-ietf-tsvwg-di… Benjamin Kaduk