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How can I configure my Barracuda Spam Firewalls to work with the Barracuda Load Balancer using Direct Server Return (DSR) mode?

  • Type: Knowledgebase
  • Date changed: 4 years ago
Solution #00002181

All Barracuda Load Balancers in use with all Barracuda Spam Firewalls, firmware versions 3.5.12 and above.

Using Direct Server Return mode on the Barracuda Load Balancer requires a non-arping loopback adapter for each real server, for each relevant virtual IP. When load-balancing Barracuda Spam Firewalls, a manual configuration is required on each Barracuda Spam Firewall.

To configure one or more non-arping loopback adapters on the Barracuda Spam Firewall, navigate to the Advanced > Advanced IP Configuration page of the Barracuda Spam Firewall's web interface. Under the Loopback Adapter Configuration heading, add the Virtual IP address of each service that is load-balancing the Barracuda Spam Firewall. Repeat this step for each Barracuda Spam Firewall being load-balanced. For more information about configuring Direct Server Return with the Barracuda Load Balancer, see Solution #00001223.

Additional Notes:
When load balancing Barracuda Spam Firewalls running firmware version 3.5.11 or below, you must either update your firmware to a newer version or call Barracuda Networks Technical Support to configure your Barracuda Spam Firewalls to work with your Barracuda Load Balancer.

When using any of the other deployment modes, no additional network adapters are required and setup can be completed independently, regardless of firmware version.

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