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Barracuda CloudGen Firewall

This Firmware Version Is End-Of-Support

Documentation for this product is no longer updated. Please see for further information on our EoS policy.

Transport Balancing and Multi-Link Aggregation

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Transport balancing expands the range of scenarios where Traffic Intelligence can be used. TI can be used to combine the bandwidth of multiple, identical low-bandwidth transports into one tunnel with a higher bandwidth. Instead of classifying the traffic in business critical and non-business critical traffic and sending the different kinds of traffic through different transports, you can use the built-in load balancing mechanism to direct the traffic into multiple transports and combine the bandwidth.

Transport Balancing is fully transparent to the source and the destination traffic. There are two types of balancing available:

  • Packet-based Balancing – Distributes packets, even for a single firewall session, between VPN transports. Configure packet-based balancing in the settings for the TINA VPN tunnel. Packet-based balancing requires all transports to have the same bandwidth and packet roundtrip times.
  • Session-based Balancing – Distributes firewall sessions between VPN transports. Configure session-based balancing in the connection objects for firewall rules. Session-based balancing requires all transports to have the same bandwidth.

The redundant design guarantees connectivity in case a links goes down. In combination with Traffic Intelligence and Traffic Shaping, Transport Balancing is a powerful enhancement of the Barracuda NG Firewall - increasing its connectivity and improving its traffic management capabilities.

Configuring Packet-Based Balancing

Packet-based balancing is a feature of a VPN tunnel and must be activated in addition to the firewall connection object configuration. In the VPN tunnel configuration of the VPN GTI editor, click on the tunnel that you want to configure and select the Bulk-0 transport of this tunnel. In the Advanced section tunnel configuration, activate packet-based balancing by setting the Packet Balancing parameter to Cycle within a Transport Class.

  1. Open an existing or Create a new TINA VPN Tunnel.
  2. Select the Bulk transport or tunnel.
  3. In the tunnel configuration window, click the Advanced tab. 
  4. From the Packet Balancing list, select Cycle within a Transport Class.

Configuring Session-Based Balancing

  1. Click the STATUS tab.
  2. In the Services table, click Configuration.
  3. On the Simple Config page, click Ruleset in the Operational Configuration table.
  4. From the Configuration menu in the left navigation pane, click ConnectionObjects.
  5. Create a new connection object or edit an existing one.
  6. In the VPN Traffic Intelligence (TI Settings) section, click Edit/Show.
  7. From the Balance Sessions list, select between preferred and second transport.
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