Configuring SNTP

You can work with Simple Network Time Protocol (SNTP) settings from System i® Navigator or by using the Change SNTP Attributes (CHGNTPA) command on the character-based interface.

You can use SNTP to adjust system time. Because most applications use the system time, those applications obtain accurate time from the system clock.

The options that you see in System i Navigator depend on the version of the IBM® i operating system that runs on your system and the version of IBM i Access for Windows that is used. From System i Navigator, click Help or press F1 for help that describes the procedures for your version.

To work with SNTP, follow these steps:

From System i Navigator, expand your system > Network > Servers > TCP/IP.

Right-click SNTP and select Properties. Click the following tabs to set the parameters.

Select this tab	Then do this
General	Specify whether to start SNTP when TCP/IP starts. You can set this preference for the server and the client separately.
Client	Specify up to three time servers that the client can poll. Also specify the poll interval, adjustment preferences, and logging preference.
Server	Specify your logging preference. By default, the SNTP server will serve the system time when you start it. You might want to select Server must be synchronized before valid time is served to specify that you want your system to act as a client to obtain time from another source before serving time to other clients.

Note: If you use the SNTP client through a firewall, you might need to update the firewall configuration to allow the passing of UDP packets on port 123.