computer. This feature ensures that IP addresses that are not in use become
available for other computers on the network.
• Provide Host Name If Not Specified by Client: If the DHCP client does not
have a host name, the device automatically assigns one.
• Use Additional DNS Server: The additional DNS server address allows the
network administrator to provision the DHCP clients with another DNS server
(other than the device itself).
• Override router address: : IP address for Option 3 of the DHCP message (RFC
2132 section 3.5).
• Option 66 - TFTP Server Name: This option is used to identify a TFTP server.
• Option 67 - Boot File Name: This option is used to identify the boot file name.
• Domain Name Suffix: String for Option 15 of the DHCP message (RFC 2132
section 3.17).
• WINS/NBT Node Type: Numeric value for Option 46 of the DHCP message
(RFC 2132 section 8.7).
• Option 2 - Time offset: Specifies the offset of the client's subnet in seconds from
Coordinated Universal Time (UTC). The offset is expressed as a two's
complement 32-bit integer. A positive offset indicates a location east of the zero
meridian and a negative offset indicates a location west of the zero meridian. The
code for the time offset option is 2, and its length is 4 octets.
• Option 42 - NTP server: Network Time Protocol (NTP) Servers option specifies
a list of IP addresses indicating NTP servers available to the client. Servers
should be listed in order of preference. The code for this option is 42. Its
minimum length is 4, and the length must be a multiple of 4.
• Option 150 - TFTP server: DHCP option (RFC 2132) contains one or more IPv4
addresses that the client may use. The current use of this option is for
downloading configuration from a VoIP server via TFTP; however, the option may
be used for purposes other than contacting a VoIP configuration server.
a. Click OK to save the settings.
5. If you selected 'DHCP Relay', the following appears:
Figure 44-6: Defining DHCP Relay (DHCP for LAN Bridge)
a. Click the New IP Address link; the following page appears:
Figure 44-7: Defining DHCP Server's IP Address
b. In the 'IP Address' field, enter the IP address of the DHCP server.
c. Click OK to save the settings, and then click OK again.
d. You now need to configure the WAN to operate in routing mode, which is
necessary for DHCP relay:
a. Click the Connections item (Configuration tab > Data Settings menu >
Data System > Connections).
b. Click the Edit icon corresponding to the 'WAN Ethernet' connection.
c. Select the Routing tab and then from the 'Routing Mode' drop-down list,
select Route.
d. Click OK to save the settings.
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