D-Link 800 - DFL 800 - Security Appliance, User Manual

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The NetDefendOS time zone setting reflects the time zone where the D-Link Firewall is physically
located.
Example 3.22. Setting the Time Zone
To modify the NetDefendOS time zone to be GMT plus 1 hour, follow the steps outlined below:
CLI
gw-world:/> set DateTime Timezone=GMTplus1
Web Interface
1. Go to System > Date and Time
2. Select (GMT+01:00) in the Timezone drop-down list
3. Click OK
Daylight Saving Time
Many regions follow Daylight Saving Time (DST) (or "Summer-time" as it is called in some
countries) and this means clocks are advanced for the summer period. Unfortunately, the principles
regulating DST vary from country to country, and in some cases there can be variations within the
same country. For this reason, NetDefendOS does not automatically know when to adjust for DST.
Instead, this information has to be manually provided if daylight saving time is to be used.
There are two parameters governing daylight saving time; the DST period and the DST offset. The
DST period specifies on what dates daylight saving time starts and ends. The DST offset indicates
the number of minutes to advance the clock during the daylight saving time period.
Example 3.23. Enabling DST
To enable DST, follow the steps outlined below:
CLI
gw-world:/> set DateTime DSTEnabled=Yes
Web Interface
1. Go to System/Date and Time
2. Check Enable daylight saving time
3. Click OK
3.8.3. Time Servers
The hardware clock which NetDefendOS uses can sometimes become fast or slow after a period of
operation. This is normal behavior in most network and computer equipment and is solved by
utilizing Time Servers.
NetDefendOS is able to adjust the clock automatically based on information received from one or
more Time Servers which provide a highly accurate time, usually using atomic clocks. Using Time
Servers is highly recommended as it ensures NetDefendOS will have its date and time aligned with
3.8.3. Time Servers Chapter 3. Fundamentals
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