[pcp] Genart Telechat review: draft-ietf-pcp-anycast-07
Robert Sparks <rjsparks@nostrum.com> Mon, 14 September 2015 20:09 UTC
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To: General Area Review Team <gen-art@ietf.org>, pcp@ietf.org, "ietf@ietf.org" <ietf@ietf.org>, draft-ietf-pcp-anycast@ietf.org, Brian Haberman <brian@innovationslab.net>
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From: Robert Sparks <rjsparks@nostrum.com>
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Date: Mon, 14 Sep 2015 15:09:00 -0500
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Subject: [pcp] Genart Telechat review: draft-ietf-pcp-anycast-07
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I am the assigned Gen-ART reviewer for this draft. The General Area Review Team (Gen-ART) reviews all IETF documents being processed by the IESG for the IETF Chair. Please wait for direction from your document shepherd or AD before posting a new version of the draft. For more information, please see the FAQ at <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>. Document: draft-ietf-pcp-anycast-07 Reviewer: Robert Sparks Review Date: 14 Sep 2015 IETF LC End Date: past IESG Telechat date: 17 Sep 2015 Summary: On the right track, but has issues that should be discussed I can't find any response to the LC review provided below. Apologies if I'm just failing to find or remember a thread... Reviewing the diff between -06 and -07, I see some text in the introduction that touches point 1. I think, however, it would be good to have something more strongly prescriptive. There's also new text in 5.2 that looks like it's targeting point 4, and I think it's sufficient. The other points do not appear to be addressed. RjS On 6/4/15 2:20 PM, Robert Sparks wrote: > I am the assigned Gen-ART reviewer for this draft. For background on > Gen-ART, please see the FAQ at > > <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>. > > Please resolve these comments along with any other Last Call comments > you may receive. > > Document: draft-ietf-pcp-anycast-06 > Reviewer: Robert Sparks > Review Date: 04Jun15 > IETF LC End Date: 11Jun15 > IESG Telechat date: Not yet scheduled > > Summary: On the right track, but has issues that should be discussed > > This draft reads easily, but there are a few things that might need > more attention. > It could be that these have been beaten to death already, but if so, > it would be better if the document gave pointers to places where > others with the questions wouldn't be left wondering. > > Issues: > > 1) The document recommends hard-coding these addresses into > applications. In the spirit (at least) of BCP 105 (RFC4085), shouldn't > the recommendation be more "have their configuration set by default to > this well known value"? > > 2) Section 3 punts on some really hard things that deserve more > discussion in this document, or this document should point to a good > discussion elsewhere. It's fine that the document doesn't solve the > synchronization or coordination problems it hints at, but it should > make it more clear that these problems will exist, and are important > to consider when deploying a new node that joins this anycast address. > In particular, without careful synchronization and coordination, > applications like VoIP using PCP controlled resources will be > disrupted. The current text really does not convey that message. > > 3) Aren't there some new security issues with just having the > well-known address? At a minimum, it's an attractive target, and the > guidance in 18.3.1 of RFC6887 may be particularly relevant. More > subtly, would it make it easier to construct packets that look enough > like PCP to be disruptive to send from compromised nodes participating > in a DDos Attack from inside an administrative domain? Would it make > it easier for an attacker that has partially compromised a host > influence the firewall between him and that host, making finishing the > compromise even easier? (Especially compared to a PCP server that was > configured at the client that wasn't just the default router). > > 4) It would help to expand on the 3rd paragraph of section 5.2. In > very simple scenarios (like having a home router start responding to > this address), it's easy to see the tradeoffs between automatic > configuration and securing the pcp commands. But it would help if the > document talked through the consequences of not using > pcp-authentication in more complex environments (using something like > a departmentalized university, or several distinct administrative > domains behind a common CGN as an example perhaps?) >
- [pcp] Genart LC review: draft-ietf-pcp-anycast-06 Robert Sparks
- [pcp] Genart Telechat review: draft-ietf-pcp-anyc… Robert Sparks