[ntp:questions] Isolated network
Richard B. Gilbert
rgilbert88 at comcast.net
Wed Nov 19 23:21:00 UTC 2008
Mike Griffin wrote:
> I have an isolated network which has no connections to the outside
> world. This includes any type of modem access.
> The machines are running Red Hat Enterprise Linux 5.2 and I also have
> Cisco routers involved. What I would like to do is to assign one of my
> RHEL machines as my NTP server and have it synch off its local system
> clock. The other machines and routers would synchronize off this
> assigned server.
> I'm not concerned with time accuracy to the real world, I just need
> time relevance within the network.
> I have searched and it seems to be extremely difficult to find good
> guidance for this.
> Thanks in advance.
If at all possible, get some sort of "hardware reference clock". A GPS
timing receiver works very well. Garmin offers one for less than $100 US.
It is extremely difficult to get tight synchronization without a stable
reference. Think of one drunken driver trying to follow another! A GPS
receiver gives you a stone cold sober driver who is right between the
If you don't mind differences between machines that might be as large as
a second or two, save your money!
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