ZyXEL NSA-2400 ユーザーガイド

 Chapter 8 Maintenance Screens

NSA-2400 User’s Guide

Use this screen to select a time zone and a time server from which your NSA-2400 can get the 
time and date. This time is then used in NSA-2400 logs and alerts.

Time lag occurs when the time on the NSA-2400 falls behind the time on the time server. This 
may happen if:

• the time server is no longer reachable

• if the NSA-2400 is shut down often (the NSA-2400 internal battery keeps time when the 

NSA-2400 is shut down and this may cause possible variance)

• power surges occur. 

The NSA-2400 gives no warning if time lag occurs. You should resynchronize the time after a 
power surge or after you have shut down the NSA-2400 several times.

The NSA-2400 time and date must be the same as the time and date on the external domain 
controller if the NSA-2400 is using one. To ensure this, you could use your domain controller 
as your time server if it has this function. Select Set My Own Timeserver and then enter the 
domain controller's IP address in Time Server Address. You can then in turn, set your 
domain controller to use another time server on the Internet.

When you turn on the NSA-2400 for the first time, the date and time start at 2000-01-01 
00:00:00. The NSA-2400 then attempts to synchronize with one of the following pre-defined 
list of time servers. A time server is a server that keeps the correct time. It can assign time to 
the NSA-2400. 

The NSA-2400 tries to connect to the following pre-defined list of time servers if you do not 
specify one or it cannot synchronize with the time server you specified. 

"

These are the time servers available on the NSA-2400 at the time of writing.

 

Table 47   Default Time Servers

ntp.nasa.gov

pool.ntp.org

asia.pool.ntp.org

a.ntp.alphazed.net