Barracuda Link Balancer

Advanced Internet Link Load Balancing

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Frequently Asked Questions

How does the Barracuda Link Balancer decide which link should handle client requests?

The Barracuda Link Balancer automatically evaluates connections using saturation, availability, latency, and performance. Taking these conditions into account, the Barracuda Link Balancer dynamically selects the best link to handle Internet traffic.

To which applications can the Barracuda Link Balancer apply Quality of Service (QoS) rules?

Administrators can choose from dozens of predefined applications or apply QoS rules to selected custom port ranges.

Can the Barracuda Link Balancer manage DHCP and DNS requests?

Yes. The Barracuda Link Balancer integrates both DHCP and DNS caching servers to simplify managing IP networks.

Can the Barracuda Link Balancer handle my VPN traffic?

Yes. The Barracuda Link Balancer can pass VPN traffic using 1:1 NAT or port forwarding.

Can I use the Barracuda Link Balancer at the perimeter as a firewall?

Yes. As an appliance designed for the perimeter, the Barracuda Link Balancer offers firewall functions to maximize the number of active Internet connections. By offering traditional firewall features such as network address translation (NAT), 1:1 NAT, and port forwarding, as well as DCHP and DNS caching services, the Barracuda Link Balancer increases the availability of Internet links to the network without the cost of more bandwidth.

Can the Barracuda Link Balancer provide failover and link balancing of inbound traffic?

Yes. The Barracuda Link Balancer provides inbound link balancing and failover through authoritative DNS services. Traffic inbound to host machines can be balanced across multiple links without using special routers, Border Gateway Protocol (BGP), or additional ISP support. Configuration is as simple as assigning each host a different Internet IP address for each Internet link used to reach it. The Barracuda Link Balancer can then distribute inbound traffic across multiple Internet links to the host by returning the IP address of the most appropriate Internet link when responding to DNS queries.

Does the Barracuda Link Balancer support high availability configurations?

Yes. A pair of Barracuda Link Balancers can be setup as an active-passive cluster for high availability deployment. The two devices share a virtual IP address with automatic failover and failback. Clustering synchronizes configuration settings between the devices. High availability deployment is possible when the Barracuda Link Balancer is used as a firewall or as a transparent device in front of a firewall.

Would my file download speed increase by implementing the Barracuda Link Balancer?

It depends on the situation. When there are multiple concurrent data transfers taking place between different sets of hosts, the Barracuda Link Balancer balances the respective connections across the available links, preventing congestion or saturation to guarantee the quickest possible download.

However, if there is no congestion or link saturation, then the short answer is no.

How can I determine the right model for my IPsec VPN needs?

The product data sheet provides the number of maximum remote IPsec peers for each model. This assumes a single local subnet to remote subnet transport over a given tunnel, referred to as a phase 2 entry. Multiple transports would reduce the capacity.

For example, the model 330 supports a maximum of 20 VPN peers. However, if each tunnel to the peers has two phase 2 entries, then the effective number of maximum VPN peers would be 20/2 = 10. Also note that the maximum number of phase 2 entries supported per tunnel is three.

For answers to additional questions, please contact Barracuda Networks at +1 888 268 4772