[lug] Time sync w/GPS or radio
bgiles at coyotesong.com
Thu May 8 10:52:52 MDT 2008
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
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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