NTP Server

An NTP server is set up on kabru to provide current time to computers in RTCL network.

Configuration on kabru

Kabru uses the NTP server of the EECS department, a server of the University, and four random servers from the US NTP server pool to establish its clock.

restrict default noquery nomodify
restrict 127.0.0.1
restrict 10.0.0.0 mask 255.0.0.0
driftfile /var/lib/ntp/drift/ntp.drift
logfile /var/log/ntp
server ntp.eecs.umich.edu
server ntp.itd.umich.edu
server 0.us.pool.ntp.org
server 1.us.pool.ntp.org
server 2.us.pool.ntp.org
server 3.us.pool.ntp.org

Reference configuration for computers in RTCL network

The IP address of NTP server is provided with DHCP replies. Some OS can be configured to modify NTP configuration file after receiving DHCP replies. For example, you can set the variable DHCLIENT_MODIFY_NTP_CONF to yes in /etc/sysconfig/network/dhcp in SUSE Linux. Otherwise, the following configuration should work, too.

restrict default noquery notrust nomodify
restrict 127.0.0.1
restrict ntp.rtcl
driftfile /var/lib/ntp/drift/ntp.drift
logfile /var/log/ntp
server ntp.rtcl

References

1. Access control options in ntp.conf
2. pool.ntp.org: Public NTP time server for everyone

-- Main.chtsai - 01 Mar 2007