Re: IP address <--> Global Positioning System (GPS)
From: Walter Dnes (waltdnes@waltdnes.org)Date: 05/29/02
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From: Walter Dnes <waltdnes@waltdnes.org> Date: 29 May 2002 03:47:47 GMT
On Mon, 27 May 2002 19:11:54 -0400, Will Packard, <will@nortelnetworks.com> wrote:
> Satellite orbital drift is somewhat random. OTOH, the resulting
> changes in delay and doppler shift are *very* predictable when
> the latest positioning information is determined, and can be
> modeled with very modest hardware.
>
> I don't know if ionospheric effects come into play or not,
> but they may be much more difficult to model. I wouldn't bet my
> reputation on it, though.
OK, so the remote system on the other side of town can be pinpointed
via GPS to a few cm. So how do you protect against somebody forging
this info ? And don't expect to use timing of received packets. Real
life example I ran into several months ago, before my employer switched
providers. I ran traceroutes trying to figure out why I was having
problems logging into work from home. The traceroutes were hilarious.
- half a dozen steps from my former ADSL provider in Toronto to UUNET
in Chicago
- half a dozen steps from Chicago to my employer's firewall in
Toronto, approximately 4 miles from my condo
- 200+ millisecond trip times; ouch
-- Walter Dnes <waltdnes@waltdnes.org> I'm not repeating myself; I'm an X Window user, I'm an ex-Windows user
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