WAN load balancing and ISP merging with 4 ADSL connections.

[Bot5]

I have a pair of FortiGate 201F in HA  currently running with 1 ADSL link.

We need to add 3 more ADSL links to the existing connection.

I am finding a way if we can merge all the 4 ADSL connection for increased bandwidth.

What would be the best way to achieve this...!!!

Looked in old communities and came across WAN-LLB and SD-WAN.

I believe WAN-LLB is for of firmware versions and SD-WAN is for current firmware.

Is there a way where we can merge all the ISP connections to increase bandwidth, or only load balancing and failover is the only possibility..?

[pgautam]

Hi @Bot5

Thank you for posting your query.

Is there a way where we can merge all the ISP connections to increase bandwidth, or only load balancing and failover is the only possibility..?

Please find the answer to your query:-

- It is recommended to configure SD-WAN to load balance and utilize all the 4 wan interface bandwidth efficiently.
- ISP technology cannot be combined and we cannot send a few packets via one interface and a few packets via other interfaces
- We can not merge all the ISP connections
- We can do load share between the interfaces

- To configure SD-WAN you can follow the below guide

https://docs.fortinet.com/document/fortigate/7.0.12/administration-guide/708464/maximize-bandwidth-s...

Regards
Priyanka

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[Bot5]

Hi Priyanka,

The FortiGate is in HA.

Do we have any technote in FortiGate documentation detailing this traffic flow..?

Thanks in advance.