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[ppml] [address-policy-wg] 2005-01 - Last Call for Comments(HD-ratio Proposal)
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Davis, Terry L
terry.l.davis at boeing.com
Thu Feb 23 17:51:34 CET 2006
Geoff/Randy Just as an aside, efficiency targets probably won't work when applied to mobile networks. Most large global mobile (ships & planes) platforms won't use but a much smaller fraction of the assignment. /24 is the smallest workable unit for global movement with any currently defined schemes. Localized mobility (trains/ferries/trucking) within a small geographical area (or even possibly even a region) may be able to get higher efficiencies depending on strategy/architecture. Take care Terry -----Original Message----- From: Geoff Huston [mailto:gih at apnic.net] Sent: Wednesday, February 22, 2006 7:44 PM To: Randy Bush Cc: ppml at arin.net; address-policy-wg at ripe.net; sig-policy at apnic.net Subject: Re: [ppml] [address-policy-wg] 2005-01 - Last Call for Comments(HD-ratio Proposal) At 02:07 PM 23/02/2006, Randy Bush wrote: > > HD Ratio Ratio Mean Std Dev > > 0.98 1.04868 0.02285 > > 0.97 1.25899 0.03363 > > 0.96 1.45854 0.03371 > > 0.95 1.63073 0.02848 > > 0.94 1.78332 0.01859 > >and what does .98 do to the flight ceiling of small folk? > >randy I'll respond to this question, but in the interests of not wishing to overwhelming a whole swag of mailing lists I'll make this my last posting on this topic today. An HD Ratio of 0.98 imposes a higher efficiency target than the existing 80% rate for all prefix sizes smaller than a /16, and lower than 80% for allocations greater than a /16 (e.g. an HD Ratio of 0.98 implies an efficiency threshold of 72% for a /9 allocation.) As an example, if you had an end use population of between 3,277 and 6,554 numbered devices you would qualify for a /19 allocation under an 80% rule, while under an HD Ratio of 0.98 the end use population is between 3,468 and 6,841, corresponding to a required address efficiency level of 84% on this address block in order to qualify for a further address allocation. The use of an HD Ratio of 0.96 corresponds to an 80% efficiency level for a /24, so that 0.96 is no worse than 80% for all allocations, whereas HD Ratios greater than 0.96 impose an efficiency constraint greater than 80% on the smaller address blocks (/16 through to /24) - this can be easily modelled on any spreadsheet of course. regards, Geoff _______________________________________________ PPML mailing list PPML at arin.net http://lists.arin.net/mailman/listinfo/ppml
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