[Gen-art] Gen-ART review of draft-atlas-icmp-unnumbered-08
<Black_David@emc.com> Sun, 27 December 2009 22:53 UTC
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Thread-Topic: Gen-ART review of draft-atlas-icmp-unnumbered-08
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From: Black_David@emc.com
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Subject: [Gen-art] Gen-ART review of draft-atlas-icmp-unnumbered-08
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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-atlas-icmp-unnumbered-08 Reviewer: David L. Black Review Date: December 27, 2009 IETF LC End Date: January 1, 2010 Summary: This draft is on the right track, but has open issues, described in the review. Comments: The draft defines an extension to ICMP messages that allows additional network interface information to be provided with some ICMP messages. The information may be an ifIndex, an IP address, an Interface Name and/or an MTU. The one open issue in this review involves the use of ifIndex to identify an interface. The motivating use cases in section 3 involve traceroute, ACL-caused-blockage, and the need to determine the MTU - those use cases are "public" in the sense that they clearly encompass use of the ICMP messages by other than the network operator whose device generated those messages. In this context, IP address, Interface Name and MTU are all clearly useful, but I am concerned about ifIndex. An ifIndex is effectively private to the SNMP management infrastructure of the network operator. Determining what interface an ifIndex designates generally involves SNMP access that a network operator may be reluctant to grant to outsiders due to the level of detail that such access may expose. I suspect that the ifIndex could be *very* useful to an ifIndex- enhanced traceroute issued from a network operator's management station as alluded to in paragraphs 3-5 of Section 6 (Security Considerations). My open issue is that I should have to go all the way down to the latter part of the Security Considerations section in order to find the motivations for and intended usage of one of the major features of this extension. I suggest adding a Section 3.3 to discuss use of ifIndex with ICMP and network management tools (e.g., enhanced traceroute plus an SNMP manager) by a network operator to debug his/her own network. This new section should also contain some sort of warning that ifIndex information may not be available to other than the network operator's management applications (with a pointer to the Security Considerations section). Nits: - Section 2: "o that interface is numbered" Please add a definition of "numbered" for an interface. - Section 4.1: Explain what a C-Type is. A few words and a reference to Section 8 of RFC 4884 should suffice. - Section 5.4: This appears to be poorly stated: A single instance of IP Address information MAY be included only in the following circumstances: Included in what? I presume an Interface Information Object. Also, MAY ... only is poor usage of RFC 2119 terminology. Here's an attempt at better phrasing: When an Interface Information Object contains an IP Address, one of the following two conditions MUST be true: idnits 2.11.15 did not find any nits. Thanks, --David ---------------------------------------------------- David L. Black, Distinguished Engineer EMC Corporation, 176 South St., Hopkinton, MA 01748 +1 (508) 293-7953 FAX: +1 (508) 293-7786 black_david@emc.com Mobile: +1 (978) 394-7754 ----------------------------------------------------
- [Gen-art] Gen-ART review of draft-atlas-icmp-unnu… Black_David
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Black_David
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Carlos Pignataro
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Carlos Pignataro
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Carlos Pignataro
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Carlos Pignataro
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Black_David
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Carlos Pignataro
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Black_David
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Carlos Pignataro (cpignata)
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Black_David
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Black_David
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Black_David
- [Gen-art] FW: Gen-ART review of draft-atlas-icmp-… Black_David
- Re: [Gen-art] Gen-ART review of draft-atlas-icmp-… Black_David