ZyXEL Communications ZyWALL 300 User Manual
Chapter 43 System
ZyWALL USG 300 User’s Guide
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43.3.1 Pre-defined NTP Time Servers List
When you turn on the ZyWALL for the first time, the date and time start at 2003-01-01
00:00:00. The ZyWALL then attempts to synchronize with one of the following pre-defined
list of Network Time Protocol (NTP) time servers.
00:00:00. The ZyWALL then attempts to synchronize with one of the following pre-defined
list of Network Time Protocol (NTP) time servers.
The ZyWALL continues to use the following pre-defined list of NTP time servers if you do
not specify a time server or it cannot synchronize with the time server you specified.
not specify a time server or it cannot synchronize with the time server you specified.
When the ZyWALL uses the pre-defined list of NTP time servers, it randomly selects one
server and tries to synchronize with 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 servers have been tried.
server and tries to synchronize with 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 servers have been tried.
43.3.2 Time Server Synchronization
Click the Synchronize Now button to get the time and date from the time server you specified
in the Time Server Address field.
in the Time Server Address field.
When the Please Wait... screen appears, you may have to wait up to one minute.
End Date
Configure the day and time when Daylight Saving Time ends if you selected
Enable Daylight Saving. The at field uses the 24 hour format. Here are a
couple of examples:
Daylight Saving Time ends in the United States on the first Sunday of November.
Each time zone in the United States stops using Daylight Saving Time at 2 A.M.
local time. So in the United States you would select First, Sunday, November
and type 2 in the at field.
Daylight Saving Time ends in the European Union on the last Sunday of
October. All of the time zones in the European Union stop using Daylight Saving
Time at the same moment (1 A.M. GMT or UTC). So in the European Union you
would select Last, Sunday, October. The time you type in the at field depends
on your time zone. In Germany for instance, you would type 2 because
Germany's time zone is one hour ahead of GMT or UTC (GMT+1).
Enable Daylight Saving. The at field uses the 24 hour format. Here are a
couple of examples:
Daylight Saving Time ends in the United States on the first Sunday of November.
Each time zone in the United States stops using Daylight Saving Time at 2 A.M.
local time. So in the United States you would select First, Sunday, November
and type 2 in the at field.
Daylight Saving Time ends in the European Union on the last Sunday of
October. All of the time zones in the European Union stop using Daylight Saving
Time at the same moment (1 A.M. GMT or UTC). So in the European Union you
would select Last, Sunday, October. The time you type in the at field depends
on your time zone. In Germany for instance, you would type 2 because
Germany's time zone is one hour ahead of GMT or UTC (GMT+1).
Offset
Specify how much the clock changes when daylight saving begins and ends.
Enter a number from 1 to 5.5 (by 0.5 increments).
For example, if you set this field to 3.5, a log occurred at 6 P.M. in local official
time will appear as if it had occurred at 10:30 P.M.
Enter a number from 1 to 5.5 (by 0.5 increments).
For example, if you set this field to 3.5, a log occurred at 6 P.M. in local official
time will appear as if it had occurred at 10:30 P.M.
Apply
Click Apply to save your changes back to the ZyWALL.
Reset
Click Reset to begin configuring this screen afresh.
Table 197 System > Date and Time (continued)
LABEL
DESCRIPTION
Table 198 Default Time Servers
0.pool.ntp.org
1.pool.ntp.org
2.pool.ntp.org