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Barracuda CloudGen Firewall

Example - DHCP Configuration for Two Networks

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The following article provides an overview of how to configure DHCP for an example environment. It provides steps and example settings to configure a DHCP service for an environment that contains two networks with three different IP pools. 

Example Environment

For the example environment that is displayed in the following figure, a DHCP service must configured for two networks with three different IP pools: 

  • Network 1 (10.0.8.0/24) – Contains two address pools: one pool for unknown clients and one pool for known clients (identified via their MAC addresses).
  • Network 2 (10.0.4.0/24) – Contains one address pool for unknown clients and two known clients.

dhcp_enterprise_conf.png

Example Environment Configuration

The DHCP service for the example environment can be configured with the following steps and settings:

StepSettings for Example Environment

Step 1: Introduce IP addresses for the DHCP service

On the Box > Network page, click IP Configuration from the Configuration Mode menu in the left navigation pane. In the Shared networks and IPs section, click + and add the following addresses:
  • eth0: 10.0.8.35 
  • eth1: 10.0.4.44
Step 2: Create the DHCP serviceBy default, Service Availability for the DHCP service is set to All-IPs.
Step 3: Enable advanced DHCP settings.To enable the advanced DHCP settings, you must be in the Advanced Configuration mode. On the DHCP Enterprise Configuration - Operational Setup page , click Switch to  Advanced View from the Configuration Mode menu in the left navigation pane. Make sure that you select yes from the Use Advanced Pool Configuration list .
Step 4: Configure DHCP classes.A DHCP class named testclass is created with the following settings:
  • Match TypeMAC
  • Match Value List: 1:00:01:f3:34:44:2g and 1:00:01:f3:34:44:2e

    For Ethernet interfaces, you must enter 1: before the MAC address

Step 5: Configure subnets and address pools.

Two separate subnets are created for Network 1 (10.0.8.0/24) and Network 2 (10.0.4.0/24).

  1. A subnet named Subnet1 for 10.0.8.0/24 is created with the following settings:
    • Subnet Typeexplicit
    • Network Address10.0.8.0/24
    • Address Pools: The two address pools for Subnet1 are configured with the following settings:

      Address PoolDescription
      Address Pool 1 - UnknownFrom the first address pool, only unknown clients may receive IP addresses. This address pool is configured with the following settings:
      • IP Begin: 10.0.8.10
      • IP End: 10.0.8.15
      • Denied Classes: testclass
      • Known Clients: deny
      • Unknown Clients: allow
      Address Pool 2 - ClasspoolFrom the second address pool, only allowed classes may receive IP addresses. This address pool is configured with the following settings:
      • IP Begin: 10.0.8.20
      • IP End: 10.0.8.30
      • Allowed Classes: testclass
      • Known Clients: not-set
      • BOOTP Clients Policy: not-set
  2. A subnet named Subnet2 for 10.0.4.0/24 is created with the following settings:
    • Subnet Typeexplicit
    • Network Address10.0.4.0/24
    • Address Pools: The subnet has one address pool which is configured with the following settings:

      Address PoolDescription
      Address Pool 1 - UnknownFrom the address pool, only unknown clients may receive IP addresses. This address pool is configured with the following settings:
      • IP Begin: 10.0.4.10
      • IP End: 10.0.4.15
      • Known Clients: deny
      • Unknown Clients: allow
Step 6: Configure known clients.

Two client groups are created:

Client GroupSettings
Known Client 1
  • MAC Address: 00:01:f3:34:44:2g
  • Fixed IP Address: 10.0.4.31 (Optional)
Known Client 2
  • MAC Address: 00:01:f3:34:44:2e
  • Fixed IP Address: 10.0.4.32 (Optional)
Step 7: View real-time information for the DHCP service.To view and modify lease and IP range information for the DHCP service, click the DHCP tab.
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