Thread View: comp.sys.next.sysadmin
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3 total messages
Started by Operator
Tue, 22 Dec 1992 22:09
question about ntp
Author: Operator
Date: Tue, 22 Dec 1992 22:09
Date: Tue, 22 Dec 1992 22:09
10 lines
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I want to know if there is an easy way to add a line to the crontab file so that at (say) 2am every night, my machine (at home) slips into the local network, and resets the system clock... I want to do this because the clock slips badly here (I don't know about other places) thanks, -nate sammons ns111310@longs.lance.colostate.edu
Re: question about ntp
Author: Dan Danz
Date: Wed, 30 Dec 1992 03:47
Date: Wed, 30 Dec 1992 03:47
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Operator writes > I want to know if there is an easy way to add a line to the crontab > file so that at (say) 2am every night, my machine (at home) slips into > the local network, and resets the system clock... I want to do > this because the clock slips badly here (I don't know about other places) From the /usr/adm/daily file for my home system: # synchronize the time with time server in the office /usr/ucb/logger -p local3.info -t daily Beginning /usr/dialupip/bin/duioctl slip0 bringup sleep 60 /usr/etc/ntp -s timehost For the uninitiated, you can't just run the ntp daemon on your local machine because it will forever be bringing up the dialup SLIP line. So you have to put up with some inaccuracy. -- L. W. "Dan" Danz (WA5SKM) VOS Mail: Dan_Danz@vos.stratus.com Sr Consulting Software SE NeXT Mail: dan@az.stratus.com Customer Assistance Center Voice Mail/Pager: (602) 852-3107 Telecommunications Division Customer Service: (800) 828-8513 Stratus Computer, Inc. 4455 E. Camelback #115-A, Phoenix AZ 85018
Re: question about ntp
Author: Bob Sutterfield
Date: Wed, 30 Dec 1992 21:49
Date: Wed, 30 Dec 1992 21:49
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In article <1hr64iINNmq7@transfer.stratus.com> dan@quiensabe.az.stratus.com (Dan Danz) writes: ...you can't just run the ntp daemon on your local machine because it will forever be bringing up the dialup SLIP line. So you have to put up with some inaccuracy. If your SLIP (or PPP) software offers a packet filtering capability, this isn't a problem. For example, my home workstation will pass NTP packets on the wire when the link is already up for some other purpose, but an NTP packet isn't interesting enough to cause the link to be brought up, nor does an NTP packet count against the idle timer. So the NTP daemon gets to look at its peers only when I'm already using the line for something else that matters more to me than timekeeping. My normal activity, connecting between home and office (and thence to the Internet), keeps the line up often enough and long enough to allow my home NTP daemon to get a good chime fix from the office servers. It drifts a little more than if it had a full-time connection, but far less than if it only got a snapshot once a day. Packet filters are good for something besides building firewalls. -- Bob Sutterfield, Morning Star Technologies +1 614 451 1883 1760 Zollinger Rd, Columbus Ohio USA, 43221 +1 800 558 7827 bob@MorningStar.Com +1 614 459 5054 (FAX)
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