Installing and Administering Internet Services

Chapter 7 229
Configuring NTP
Querying xntpd
synchronization source. A ‘-’ indicates a host that was not considered for
synchronization, while a ‘+’ indicates a host that was considered for
synchronization.
The refid column shows the current source of synchronization for the
remote host. ‘.WWVB.’ indicates that the host uses a radio clock that
receives time signals from the U.S. government radio station WWVB.
The st column shows the stratum level of the remote host.
The when column shows the number of seconds since the remote host
was last heard from.
The poll column shows the polling interval to the remote host, as
determined by xntpd. You can define the minimum polling interval with
the minpoll option in the peer, server, or broadcast definitions in
the /etc/ntp.conf file. See the xntpd man page for more information
on setting this option.
The reach column shows the status of the reachability register in octal
format. See the RFC for information on how to interpret this value.
The delay, offset, and dispersion columns show the value, in
milliseconds, computed for the remote host.