how to configure wan load balancing on fortigate 80c

I would go a bit further if I was deploying a load-balancer I would want to make sure the connections between the load-balancer and modems are properly configure (e.g. That said, the TL-R470T+ would make a good choice for off-loading the complexity/ processing power/resources on the 80CM - If you had a more powerful Fortigate I would say try the load-balancing stuff directly from the Fortigate.Īs for determining if the 80CM is adequate to the task – if it is already up and running on your network, what is the CPU/memory usage on it like? If the 80CM is pushing >80% CPU usage or >78% memory usage then I say it's time to upgrade. Personally, I'm not really a big fan of TPlink and only wished the TL-R470T+ had a 1-GB internal port (personal opinion only). (One nice thing about this is if the Fortigate failed, you can remove it and connect your internal network directly to the load-balancer.) If you can place the 80CM into transparent mode then ideally (along with the ADSL modems in bridge mode), you can go from ->fgt->->Load-balancer->Internet.

I would try to remove much of this NAT complexity as possible, starting with seeing if the ADSL modems can be placed into bridge mode - this should allow the load-balanacer to obtain 'outside' IP addresses once it is configured for all four modem connections. I am dead set against setting up an internal network (if I can help it) that would result in a double NAT situation - what you are proposing would result in a triple NAT substation (->192.168.5.x->->Internet). (If you currently do not have dead-gateway detection configured on the WAN ports then naturally the Internet will stop once you unplug one of the cables from the WAN ports.) It looks like you already have load-balancing between the two WAN ports on the Fortigate - you will need to disconnect/disable one of the WAN ports (I would choose WAN2) and let internal traffic flow though the remaining WAN port, to the load-balancer.

How to configure wan load balancing on fortigate 80c