This solution applies to all Barracuda Link Balancers all firmware versions.
By default, the Barracuda Link Balancer will allow all outgoing connections. Outbound firewall rules can be created to block certain connections trying to leave your network, and they are configured on the Firewall > Outbound page of the Barracuda Link Balancer's web interface.
To allow specific IP addresses, ports or applications to make outgoing connections, navigate to the Firewall > Outbound page and click the Add New Firewall Rule button. In the new window that appears,
- Enter a Rule Name.
- Select whether this rule will become active immediately (select either Enabled or Disabled).
- Choose an Action; this rule will either Block or Allow matching traffic.
- Choose the specific Protocol to monitor (by default, ANY protocols are monitored).
- Select the Source and Destination of the connections that will be affected by this rule. By default, any source or destination will be affected by this new rule. If you would like to narrow down the possible connections that will meet this rule, you may specify a Single Host or a Network as the Source or Destination. If you do so, you will need to enter the corresponding IP Address and Subnet Mask in order to define the Source or Destination Single Host or Network.
- Choose the specific Application that will be covered by this rule. By default, all applications are included in a new rule, but you can choose a specific application from the drop-down menu if you prefer. To specify a Port instead, enter the port number in the empty field.
- Finally, provide a Description of the rule.
The rules are arranged on the Firewall > Outbound page in order of precedence. If more than one rule apply to a given connection, only the first (uppermost) rule that matches will be executed.
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