Configuring Custom DHCP Options (NSM Procedure)

When configuring a DHCP server, you can also configure custom DHCP options to handle address assignment for voice-over-IP (VoIP) phones.

Note: Custom DHCP options are not supported on the NetScreen-500, the NetScreen-5200, the NetScreen-5400, the ISG1000 and the ISG2000.

A custom DHCP option contains:

Your network recently added support for VoIP, and you now need to support DHCP for VoIP phones. You edit the existing DHCP server configuration to send the following custom options to IP phones acting as DHCP clients:

The example assumes that you have already configured a security device to act as a DHCP server.

To customize your DHCP options:

  1. In the NSM navigation tree, select Device Manager > Devices. Double-click the device currently handling your DHCP assignments.
  2. In the device navigation tree, select Network > Interface. Double-click an interface. The General Properties screen appears.
  3. In the interface navigation tree, select DHCP, set the DHCP mode to Server, and then select the Custom Options tab.
  4. Click the Add icon to add the first custom option. Configure the following options, and then click OK:
    • For Option Name, enter IP Address.
    • For Code, enter 66.
    • For Data Type, select IP ADDR.
    • For Value, enter
    • Click the Add icon to add the second custom option. Configure the options as mentioned in Step 4, and then click OK:
  5. Click OK to save your changes to the interface, and then click OK again to save your changes to the device.

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