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Barracuda Link Balancer


As of 1st March 2019, all new sales for the Barracuda Link Balancer product will cease. Only renewals of software and hardware subscriptions for a maximum of one year is available for a limited time. 1st March 2020: All Barracuda Link Balancer sales will cease; neither new sales nor any renewals will be available. If you currently hold a maintenance and support contract, you will continue to receive our award-winning support and services until your contract expires.

How To Create IP/Application Routing Rules

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The IP/Application Routing section lets you create rules based on source IP address, application, and/or destination IP address that exempt outgoing traffic from link balancing and/or NAT'ing. Traffic matching no rule continues through link balancing and NAT'ing. These rules are executed regardless of the firewall operating mode.

Create an IP/Application Routing Rule

  1. Log into the Barracuda Link Balancer Interface.
  2. Go to the POLICY > Outbound Routing page.
  3. In the IP/Application Routing section, enter a unique Rule Name.
  4. In the Source IP Address field, enter the IP address (e.g. to be NAT'd.
  5. In the Source Netmask field, enter a netmask (e.g. or leave this field blank.
  6. From the Application list, select * for any protocol or port combination or select an application.
  7. Complete the action fields to specify what happens to traffic matching the condition:
    • Link Balance - Select Yes to link balance outgoing traffic across any available WAN interfaces. 
      Or, select No and then select a Primary and a Backup link:
      • Primary Link:
        • Default - Outgoing traffic is directed to the WAN link on the same subnet.
        • Or, select a specific link from the list to bind traffic to that link.
      • Backup Link:
        • None - Drop traffic if the primary link is not available.
        • Or, select a specific link from the list to bind traffic to that link.
    • Clear the NAT check box to maintain the original source IP address.
  8. Click Add.

The new rule is now added to the bottom of the IP/Application Routing table. 

Rules in the IP/Application Routing table appear in execution order, from top to bottom. Only the first matching rule is executed. To change the order of rules, drag and drop them towards the top or bottom of the list.

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