[ntp:questions] NTP server with no network, no GPS signal

Yan Seiner yan at seiner.com
Fri Apr 29 12:26:46 UTC 2011

Cristian Seres wrote:
> Hi!
> I am looking for a solution to install an NTP server in a very 
> restricted network which can not be connected to other networks even 
> through a firewall because of strict security policy. RS232 and usb 
> are ok. Using GPS or DCF77 reference clocks would require a long 
> antenna wire to get signal. Installing the antenna cable would be 
> expensive, but there is good LAN cabling between a space with good GPS 
> signal and the room with high security.
> What kind of cheap solutions would you think of? For instance, is it 
> possible to feed time signal from one NTP server to another via 
> RS232/usb? Or is there an affordable usb/rs232 reference clock which 
> has an IP based separate antenna unit?
> With best regards,

Get a wifi access point that's supported by OpenWRT and has a USB port.  
Install OpenWRT.  Install gpsd and ntpd.  Get a gps USB puck.  Set up 
access point in room with good gps reception.  Use the AP as the ntpd 
server.  It works quite well and is quite reliable and cheap.

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