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Barracuda CloudGen Firewall
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How to Configure Additional DHCP Options

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Some clients may need specific DHCP options to be set in the DHCP server configuration. To set options that are not directly configurable, you must use Advanced Pool Configuration and enter the necessary options as freetext-based configuration. In this example, a server requires the DHCP options 176 and 242 to be set to custom strings.

Before you begin

Step 1. Define a variable for each additional DHCP option

  1. Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > DHCP > DHCP Enterprise Configuration.
  2. Click Lock.
  3. In the left menu, expand Configuration Mode and click Switch to Advanced View. 
  4. In the left menu, click Operational Setup.
  5. For each DHCP option you want to add, click + in the Additional Global Definitions table and define a variable for the DHCP option in the following format:
    option VARIABLE_NAME code OPTION_NUMBER=VARIABLE_TYPE E.g., option hbcs-avaya-176 code 176 = text  
    DHCPoptions01.png
  6. Click Send Changes and Activate. 

Step 2. Set Values for Each Additional DHCP Option

The variables set in step 1 can be set to different values for each DHCP Option Template.

  1. Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > DHCP > DHCP Enterprise Configuration.
  2. Click Lock.
  3. In the left menu, expand Configuration Mode and click Switch to Advanced View. 
  4. In the left menu, click DHCP Option Templates. 
  5. Double-click on the DHCP Options template used for the address pool. The DHCP Options window opens.
  6. For each DHCP Option you defined in step 1, click + in the ISC DHCP Option Freetext Field and set the value for each entry in the following format (including the quotation marks):
    option VARIABLE_NAME-OPTION_NUMBER "ENTER_YOUR_STRING_HERE" 
    E.g., option hbcs-avaya-176 "MCIPADD=10.10.10.10,MCPORT=1719,TFTPSRVR=10.10.10.10"
    DHCPoptions02.png
  7. Click Send Changes and Activate.
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