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The ntpd time daemon is an implementation of NTP version 3. By default, ntpd sends NTP packets marked as being of the version 3 variety. However, another implementation of the NTP time daemon, called ntpd, may be running on hosts you wish to poll. If this is the case, you must include the version option in the peer or server configuration statements for those hosts to force ntpd to send packets of the version 1 variety.
For example, if the host apple.com at IP address 130.43.2.2 is a host you wish to poll in symmetric active mode and you know that apple.com is running ntpd instead of ntpd, you should include the following configuration statement in your local host's ntp.conf file:
peer 130.43.2.2 version 1 # apple.com (running ntpd)This statement ensures that version 1 NTP packets are sent by your local host to apple.com.
For interoperability with hosts running ODT 2.0 and 3.0, you must specify ``version 2'' in your local host's ntp.conf file. For example, if the host apple.com at IP address 130.43.2.2 is a host you wish to poll in symmetric active mode and you know that apple.com is running ODT 2.0, you should include the following configuration statement in your local host's ntp.conf file:
peer 130.43.2.2 version 2 # apple.com