Date/Time; Time Lag; Time/Date And External Domain Controllers; Pre-Defined Ntp Time Servers List - ZyXEL Communications NSA-2400 User Manual

8.2 Date/Time

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.

8.2.1 Time Lag

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.

8.2.2 Time/Date And External Domain Controllers

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.

8.2.3 Pre-defined NTP Time Servers List

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
NSA-2400 User's Guide
Chapter 8 Maintenance Screens
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