[189220] in North American Network Operators' Group
Re: NIST NTP servers
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Wed May 11 13:54:30 2016
X-Original-To: nanog@nanog.org
To: "Jay R. Ashworth" <jra@baylink.com>
From: Valdis.Kletnieks@vt.edu
In-Reply-To: <1506067283.128804.1462980994495.JavaMail.zimbra@baylink.com>
Date: Wed, 11 May 2016 13:54:25 -0400
Cc: North American Network Operators' Group <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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On Wed, 11 May 2016 15:36:34 -0000, "Jay R. Ashworth" said:
> CDMA and GSM are false diversity: both network types nodes *get their time*
> from GPS, so far as I know.
I'll make the fairly reasonable assumption that most readers of this list have
networks that span multiple buildings.
If somebody is managing to figure out that you have a GPS in Building 37, and a
GPS-based CDMA up on the corner of Building 3, and the *other* 4 clocks at
other locations and getting close enough to all of them at the same time to
conduct a successful spoofing attack, all just to move your time source a
few seconds off....
... then the fact that GPS is spoofable is probably *NOT* your biggest
security problem.
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