How to Configure Linux Standard Multipath Routing

The Barracuda CloudGen Firewall supports Linux standard multipath routing. Simple redundancy by next hop detection is provided by adding multiple routing entries with different route metrics. Linux-based standard multipath routing provides source IP-based balancing between next hops. Once the source destination combination is in the routing cache, this combination will stay on the selected next hop IP address. For dead next-hop detection per ARP request or session packet balancing, use ACPF-assisted multipath routing.

Step 1. Add a Linux Standard Multipath Route

1. Go to CONFIGURATION > Configuration Tree > Box > Network.
2. In the left menu, select Advanced Routing.
3. Click Lock.
4. In the left menu, expand Configuration Mode and select Switch to Advanced View.
5. In the  IPv4   Routing Table section, click  +  to add an entry:
   • Enter a Name. E.g., route1
   • Enter the Target Network Address. E.g., 192.168.100.0/24
   • Click + to add Multipath Gateways and provide the following Information: 
     • Multipath Gateway – Next hop IP address of the multipath route.
     • Weight Number  – Weight number of path (valid range from 1 - 100).
     • Assigned Source IP – The assigned source IP address.
6. Click OK.
7. Click Send Changes and Activate.

Step 2. Activate the Network Configuration

1. Go to CONTROL > Box.
2. In the left menu, expand Network and click Activate new network configuration. The Activate Network window opens.
3. Click Failsafe. The Activation Succeeded window opens.
4. Click OK.
   

Open the CONTROL > Network page. If a green icon () is displayed in the first column for the multipath route, the route is active.