Configuring SNTP Server

This topic describes how a user may configure the SNTP server.

Overview of SNTP

Simple Network Time Protocol (SNTP) is a simplified adaptation of the Network Time Protocol (NTP), that is used to synchronize computer clocks on the Internet. SNTP exchanges timekeeping information between servers and clients via the Internet. Extremely reliable sources, such as radio clocks and GPS satellite timing receivers, typically act as primary servers.

The SNTP client sends a request to a designated server at its unicast address and expects a reply. This reply helps it to determine the time and optionally, the round-trip delay and local clock offset, relative to the server.

SNTP uses User Datagram Protocol (UDP) for the transport and the UDP port number assigned to SNTP is 123.

Configuring SNTP Server

Follow these steps to configure a SNTP server-

1. If you want to add a SNTP server using its IP Address, click on the radio button next to IP address and enter the IP address, else if you want to add a SNTP server using its Domain Name, click on the radio button next to Domain Name to enter the Domain name, .
2. Click Add(Add button in the last row under action field).
   The page redisplays with the new SNTP server configured.
3. To modify the SNTP status, select the corresponding radio button (Enable\Disable) and click on Save Changes.   By default the SNTP server is disabled, you will need to enable it for it to be active. 

NOTE:

1. The system clock and hence SNTP server cannot be configured when SNTP is enabled. You must first disable SNTP before modifying the system clock. All the SNTP time-based alarms will be affected by this operation. They will either expire early or late. Also, few may expire simultaneously.
2. Modifications like Delete or Add an SNTP entry, are not allowed while SNTP is enabled.
3. A maximum of 5 SNTP Servers can be configured.

NOTE: If want your changes to be permanent, be sure to Write Settings to Flash.