On Fri, 14 Apr 2000, Mike Lewis wrote:
>
> I'm just setting up xntpd for the first time. I believe I have the server
> piece running and syncing to the various time servers. However, I have some
> questions that I've not yet been able to find the answers to:
>
> 1) Now that I have one machine on my LAN syncing to an outside source, how
> do I configure the other Linux boxen to sync to the local time server rather
> than the ones on Internet ?
In the conf file for xntpd, you just say:
server <lan time server>
and start xntpd. Remove any of the broadcast stuff, unless you really want
to use it.
>
> 2) Suppose you have several LANs that you would like to sync time on to
> some standard (not necessarily each other). Wouldn't it be better to have
> one of the LANs as a 'master' NTP server (which updates to some stratum 2
> server) and have the remainder of the LANs sync to that server ?
The way xntpd works, it would be better to point have several points of
reference. That way, if one goes 'insane', it will be ignored in favor of
the majority opinion as to what time it is.
I had a setup where I had 4 boxes that sat on the Net. I then had the
company LAN sitting behind one of those 4 boxes. I setup 3 of the Net
machines to point to several stratum 2 boxes and then pointed the inside
LAN machines to those 3 boxes (they were all Unix hosts at that point). So
unless I lost the Net altogether, time would keep insync if 1 or 2 hosts
were down or 'insane'.
The traffic from xntpd is pretty light, so unless you have to pay for bits
transferred I'd go with a setup like the above.
One setup catch, xntpd won't start adjusting time if the clock isn't close
to the correct time, I believe the range is adjustable. In any case, it is
good to make sure ntpdate is called correctly in
/etc/rc.d/init.d/xntpd, I believe recent versions of RH look for a list of
time servers in /etc/ntp/step-tickers, but you have to create that file
yourself.
>
> 3) From a previous message posted to the list, I understand that by using
> "NET TIME /SET /Y \\linuxboxen" (on WinBoxen) this will set the time to the
> 'master' NTP server on the LAN. When I try this on Win95, I get:
I seem to remember a ntp client for Windows, you might want to look into
that as it can adjust for clock drift on the local RTC.
HTH,
Bill Carlson
------------
Systems Programmer [EMAIL PROTECTED] | Opinions are mine,
Virtual Hospital http://www.vh.org/ | not my employer's.
University of Iowa Hospitals and Clinics |
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