NEC iPASOLINK EX Advanced - As NTP Client; As NTP Server; Ntp

3-6 SECURITY MANAGEMENT
GGS-000547-01E iPASOLINK EX Advanced: SET NETWORK AND SYSTEM PROVISIONING
3.1.4 NTP
NTP (Network Time Protocol) synchronizes the clocks of the server and associated
clients in a network, which is specified by the following RFCs:
iPASOLINK can be set either as NTP Client or Server. Following shows the available
functions of NTP Client and Server:
3.1.4.1 As NTP Client
When the unicast mode is selected on the NTP Client, the client sends a request to
obtain the current time to the pre-configured server, and then adjusts the clock
according to the replied information. Up to four NTP Severs can be registered via
WebLCT.
When the multicast mode is selected on the NTP Client, the client will listen to the
broadcast of the time server and then adjusts the clock according to the first received
valid broadcast and ignores the broadcasts from remaining servers if exist.
If the NTP Client receives neither a response nor broadcasts, the synchronization
among the Server and Clients cannot be accomplished, which allows to use the
current time of the equipment.
3.1.4.2 As NTP Server
When the unicast mode is selected on the NTP Server, Server will respond the current
time information to the Client.
When the multicast mode is selected, the Server will broadcast the current time
information of its own periodically.
Table 3-7 RFC Standards
RFC No. Title
RFC 1305 Network Time Protocol (Version 3) Specification, Implementation and
Analysis
RFC 2030 Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OS