Running mixed synchronization subnets
The xntpd time daemon is an implementation of
NTP version 3.
By default, xntpd 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 xntpd 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 xntpd, 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