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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 Outbound Source NAT Rules

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Create outbound source NAT rules to set the source IP address of outgoing traffic to an address other than the WAN link or the original source IP address. This policy is applied after the WAN link has been determined by the link balancing algorithm. These rules are executed regardless of the firewall operating mode.

Create an Outbound Source NAT Rule

  1. Log into the Barracuda Link Balancer Interface.
  2. Go to the POLICY > Outbound Routing page.
  3. In the Outbound Source NAT section, enter a unique Rule Name.

  4. In the Source IP Address field, enter the IP address (e.g. to be NAT'd. Alternatively, enter an IP address range (e.g. where two IP addresses separated by a hyphen "-" define a range .
  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. From the Link list, select a link to apply the rule only to traffic directed to that link. Or, select ANY to apply the rule regardless of the WAN link.
  8. In the Masquerade IP Address/Range field, enter the address or range to be used as the source IP address.
  9. Click Add.

The new rule now appears at the bottom of the Outbound Source NAT table.

Rules in the Outbound Source NAT table appear in execution order, from top to bottom. Only the first matching rule to the traffic is executed. To change the order of rules, drag and drop them towards the top or bottom of the list.

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