[lug] Time sync w/GPS or radio

[Bear Giles]

I just wanted to make sure you covered the obvious first. :-)

Have you considered using a NTP server disciplined by a synchronization 
signal from a consumer-grade GPS unit?  You would need to check the NTP 
documentation for details, but I would be surprised if you couldn't use 
one of those ~$100 units designed for use with laptops.  IIRC the server 
is primarily synced to its own internal clock or a small network of 
peered servers, and the GPS signal is used to make millisecond-scale 
corrections.

This might not be enough to give you a valid -legal- time, but it should 
get you the accurate time.

Gary Hodges wrote:
> I have some remote machines w/o internet access.  I get around that by 
> dialing in a couple times a day, but I've never liked that solution. 
> But what prompted me to start looking for a solution is...  You all 
> will love this...  I have a machine on the net behind the firewall of 
> a very large government organization where I'm not able to use a time 
> server outside the network.  And, get this, they don't keep the time 
> set on their internal time server.
>
> In case anyone is interested, I got a price quote from that UK vendor 
> this morning.  $1590 for a GPS solution and $995 for a WWVB solution.
>
>
> Bear Giles wrote:
>> Why not use NTP?  I know there are sometimes good reasons for having 
>> a primary source, but for most of us syncing with a friendly time 
>> source (not the root NTP servers!) is good enough.
>>
>> Gary Hodges wrote:
>>> I'd like to set up a solution where I keep time set on a single 
>>> linux box with either GPS or the NIST radio signal.  I've found a 
>>> company in the UK that sells what I'm after, but I'm curious if 
>>> anyone knows of a U.S. based vendor?
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>
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