Configuring NTP on AIX 5L

The following information outlines the steps to configure a basic NTP setup between an NTP client and server on AIX 5L.

On server

Verify that you have a suitable NTP server.

#lssrc –ls xntpd

NOTE: Sys peer should show a valid server or 127.127.1..

Edit /etc/ntp.conf and restart xntpd.

#vi /etc/ntp.conf

NTP Uses the configuration that IP means it will verify the Local System Clock as Reference.

Note: Double check that "broadcast client" is commented out.

#stopsrc –s xntpd
#startsrc –s xntpd

NOTE:If the server runs databases, use the –x flag tprevent the clock from changing
 in a negative direction. Enter the followin:

#startsrc –s xntpd –a "-x"

Repeat Step 1 to verify that the server is synched.This process can take up to 12 minutes.

On client:

#ntpdate –d ip.address.of.server

The offset must be less than 1000 seconds for xntpd synch.
If the offset is greater than 1000 seconds, change the time maually on the client and run the ntpdate –d again.

If you get the message, "no server suitable for synchroization found", verify xntpd is running on the server (see above).
Also no firewalls are blocking port 123.

Specify your xntp server in/etc/ntp.conf,

#vi /etc/ntp.conf
(Comment out the "broadcastclient" line and add server ip.address.of.server)

Leave the driftfile and trace file at their defaults.

Start the xntpd daemon:

#startsrc –s xntpd
(Use the –x flag if it is appropriate for your enviroment.)

Uncomment xntpd from /etc/rc.tcpip so it will start on reboot.

#vi /etc/rc.tcpip
Uncomment the following line:

start /usr/sbin/xntpd "$src_running"
If using the –x flag, add "-x" to the end of the line.
You must include the quotes around the -x.

Verify that the client is synch'ed.

#lssrc –ls xntpd

NOTE: Sys peer should display the IP address or name of your xntp server.
This process may take up to 12 minutes.

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