nanog mailing list archives
Re: Geo location to IP mapping
From: Marshall Eubanks <tme () multicasttech com>
Date: Mon, 15 May 2006 21:49:31 -0400
I seriously doubt this would work to better than the regional area.My zip code (20124) region is about 5 km across, which would be 15 microseconds in vacuum, and maybe at most 50 micro seconds in glass. So, you would need accuracies at the 10's of microsecond level to specify zip codes.
I can believe that you can measure transmission times down a fiber and achieve repeatability at the microsecond level - in fact, I remember a Michelson interferometer that they set up at JPL / Goldstone that tested the Sagnac effect in glass, which required substantially better repeatibility than that.
But do you really think that you can estimate the router delay on the (for example) 9 hops between here and GMU to better than 1 millisecond each ? (That would imply a 3 millisecond rms error if these errors were random and Gaussian, or about 1000 km in vacuum, and maybe 500 km error in glass.)
So, I think that this would fail by at least 2 orders of magnitude forzip codes in a real operational network. Which coast of the US, sure, but not much better than that.
Regards Marshall On May 15, 2006, at 5:24 PM, sgorman1 () gmu edu wrote:
The NSA was granted a patent for an IP geo-location technology based on triangulation using latency measures. We played around with a similar approach using UDP several years ago and you could triangulate to the zip code level or so. A better way I think than the current approaches being discussed. Not sure if the NSA patent is being commercialized or not though.http://news.com.com/NSA+granted+Net+location-tracking+patent/ 2100-7348_3-5875953.html
Current thread:
- Re: Geo location to IP mapping, (continued)
- Re: Geo location to IP mapping Michael . Dillon (May 16)
- Re: Geo location to IP mapping Roland Perry (May 16)
- Re: Geo location to IP mapping Jeff Rosowski (May 17)
- Re: Geo location to IP mapping Michael . Dillon (May 16)
- Re: Geo location to IP mapping Alain Hebert (May 15)
- Re: Geo location to IP mapping Valdis . Kletnieks (May 15)
- Re: Geo location to IP mapping Martin Hannigan (May 15)
- Message not available
- Message not available
- Re: Geo location to IP mapping Martin Hannigan (May 15)
- Re: Geo location to IP mapping sgorman1 (May 15)
- network triangulation (Re: Geo location to IP mapping) Edward B. DREGER (May 15)
- Re: Geo location to IP mapping Marshall Eubanks (May 15)
- Re: Geo location to IP mapping Steven M. Bellovin (May 15)
- Re: Geo location to IP mapping sgorman1 (May 16)
- Re: Geo location to IP mapping Charles Cala (May 16)
- Re: Geo location to IP mapping Marshall Eubanks (May 16)
- Re: Geo location to IP mapping Charles Cala (May 16)
- Re: Geo location to IP mapping Kevin Pawloski (May 15)
- Re: Geo location to IP mapping Michael . Dillon (May 16)