I had to build ntp packages from the source and install all of them on some hosts. After the installation, ntpdate 1.us.pool.ntp.org works for the synchronization. However, when I tried to do ntpda...

When querying ntp servers with the command ntpdate, I can use the -u argument to make the source port an unrestricted port (port 1024 and above). With ntpd, which is meant to run in the background...