Configuring an NTP Peer for a C Series Controller (C-Web Interface)
To configure NTP to operate as a peer:
Click Configure, expand System, and then click NTP.
The NTP pane appears.
In the Create new list, select Peer. Type an IPv4 or IPv6 address for the server and click OK.
Enter information as described in the Help text in the main pane, and click Apply.
If the remote system has authentication enabled, specify an authentication key and value. The system transmits the specified authentication key when transmitting packets.