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

Rob nomail at example.com
Fri Apr 29 13:01:58 UTC 2011

Yan Seiner <yan at seiner.com> wrote:
> 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.

The "we want maximum security but it must not cost a dime" people he
is working for will be delighted by the idea to add a WiFi access :-)

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