ZyXEL Communications 2 Plus User Manual

Chapter 26 Maintenance

ZyWALL 2 Plus User’s Guide

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.

The ZyWALL resets time and date settings from the time server under the following 
circumstances.

• When the ZyWALL starts up.
• When you click Apply or Synchronize Now in the Time Setting screen.
• 24-hour intervals after starting up.

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 282   Synchronization in Process

Click the Return button to go back to the Time and Date screen after the time and date is 
updated successfully.