RE: [dhcwg] Two companion IDs for consideration
Barr Hibbs <rbhibbs@pacbell.net> Tue, 26 November 2002 10:19 UTC
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Date: Mon, 25 Nov 2002 22:30:00 -0800
From: Barr Hibbs <rbhibbs@pacbell.net>
Subject: RE: [dhcwg] Two companion IDs for consideration
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To: "James M. Polk" <jmpolk@cisco.com>, geopriv@mail.apps.ietf.org
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-----Original Message----- From: dhcwg-admin@ietf.org [mailto:dhcwg-admin@ietf.org]On Behalf Of James M. Polk Sent: Wednesday, October 30, 2002 15:44 A few of us have written two companion Drafts for consideration into 2 WGs (GEOPRIV and DHC). The first ID (into the DHC WG) is at: http://www.ietf.org/internet-drafts/draft-polk-dhcp-geo-loc-option-00.tx t and defines a Location Object format... The second ID (into the GEOPRIV WG) is the semantics ID for the DHC ID. It's at: http://www.ietf.org/internet-drafts/draft-polk-geopriv-loc-object-semant ics-00.txt and shows why the meaning of "resolution" is better suited to meet the requirement of granular (im)precision than "accuracy". ...comments about the two drafts follow. --Barr draft-polk-dhcp-geo-loc-option-00: --editorial matters as you never repeat the acronym "RAIO" in the document, please spell it out completely ("Relay Agent Information Option") in the first sentence of the second paragraph of section 1.0, "Introduction." --content matters 1. the first sentence of the first paragraph of section 1.0 "Introduction" clearly limits the scope of this option to be data provided BY the server TO the client. This seems applicable to both wire-connected clients and some wireless clients (a specific access point might identify location with sufficient precision), but can you imagine a future scenario where a wireless or roaming client supplies the location information TO the server? If so, perhaps this sentence needs to be generalized, or a specific exclusion be included that prevents client to server notification (I'm not clear on how or why a DHCP server might use this information as it seems more application-oriented than network-oriented.) 2. section 1.2, "Motivation," provides some of the background for this option that I asked about above, but I see the use of the location information as application data, not entirely appropriate for DHCP. If I could see a clear motivation for needing location information at this point in the initialization process (likely to be before higher-layer protocols, such as IP telephony, are loaded and activated) I wouldn't question the need. I can think of other uses for this information besides E911 over IPtel (operations, management, and troubleshooting come to mind) but all are really applications-layer functions. 3. section 1.3, "Rationale," includes rationale for the composition of the three components of location (latitude, longitude, and altitude) but has a few interesting discrepancies. Let me state that I'm NOT an expert in geolocation, so I may not appreciate the design choices that have been made here, but I wonder why only 48 bits is used for the maximum precision of latitude and longitude? Here I'm imagining future implementations of millimeter-sized devices such as medical implants where additional precision might be considered essential. 4. in fact, I wonder whether even less-precise planar coordinates might be completely appropriate, such as room and cubicle number. If so, then some mechanism for specifying which units were employed for the coordinates would seem to be required. 5. altitude should be able to be specified to near-orbital precision in 30 bits, but I wonder if latitude, longitude and altitude is the best measure if devices are much above passenger aviation levels? Again, I'm not sufficiently conversant in the technology of location to know even what system is used for, say, the lunar lander or a mars probe, let alone what is sufficient precision, but it seems appropriate to ask. draft-polk-geopriv-loc-object-semantics-00; --my only comments on this draft are that some of the explanation and examples presented here could be included in the other draft so that it would be more complete in and of itself. _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] Two companion IDs for consideration James M. Polk
- [dhcwg] Re: Two companion IDs for consideration nabbott
- Re: [dhcwg] Re: Two companion IDs for considerati… John Schnizlein
- RE: [dhcwg] Two companion IDs for consideration Barr Hibbs
- RE: [dhcwg] Two companion IDs for consideration James M. Polk