ZyXEL Communications ZyXEL ZyWALL 2WG - Manual (Page 456)

Chapter 26 Maintenance
ZyWALL 2WG User’s Guide
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26.5 Pre-defined NTP Time Server Pools
When you turn on the ZyWALL for the first time, the date and time start at 2000-01-01
00:00:00. The ZyWALL then attempts to synchronize with an NTP time server from one of
the 0.pool.ntp.org, 1.pool.ntp.org or 2.pool.ntp.org NTP time server pools. These are virtual
clusters of time servers that use a round robin method to provide different NTP servers to
clients.
The ZyWALL continues to use the NTP time server pools if you do not specify a time server
or it cannot synchronize with the time server you specified.
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The ZyWALL can use the NTP time server pools regardless of the time
protocol you select.
When the ZyWALL uses the NTP time server pools, it randomly selects one pool and tries to
synchronize with a server in it. If the synchronization fails, then the ZyWALL goes through
the rest of the list in order from the first one tried until either it is successful or all the pre-
defined NTP time server pools have been tried.
26.5.1 Resetting the Time
The ZyWALL resets the time in the following instances:
• When you click Synchronize Now .
• On saving your changes.
• When the ZyWALL starts up.
• 24-hour intervals after starting.
26.5.2 Time Server Synchronization
Click the Synchronize Now button to get the time and date from the predefined time server or
the time server you specified in the Time Server Address field.
When the System Time and Date Synchronization in Process screen appears, wait up to one
minute.
Figure 257 Synchronization in Process
Click the Return button to go back to the Time and Date screen after the time and date is
updated successfully.