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How to Configure DHCP Option 2 Time Offset

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Article ID: KB12308 KB Last Updated: 06 Aug 2010Version: 2.0
Summary:
DHCP Custom Option 2 allows you to configure GMT timezone, to be offered when a DHCP client requests an IP address.
DHCP Option 2 is commonly used for VoIP phones.
How do you configure it on the firewall?
Symptoms:

Solution:
DHCP Option 2, which allows you to configure time offset, is based on GMT.  To configure the GMT Timezone, configure DHCP Option 2 in seconds. 

For example, to configure GMT -8, the DHCP Option 2 value is -8 hours * 3600 sec/hour = -28800.  The CLI configuration for this is as follows:

set interface bgroup0 dhcp server option custom 2 integer -28800
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