Fortigate: How to configure Load balancing for WAN using SD WAN

Overview

This article shows how to configure Load Balancing for Internet lines using SD-WAN technology on the Fortigate. Manage traffic going out of the Internet without managing switches based on hardware or WAN controllers

How to configure

Step 1: Configure create SD-WAN Interface

• Log in to Fortigate by Admin account

• Network -> Interfaces -> Check information of 2 lines Internet

• Network -> SD-WAN
• Choose Enable
• Click Create New to add 2 WAN in management table

• Click on Volume to modify the Weight parameters for the two WAN lines according to the demand
• Click Sessions to edit session parameters. For example, we set two parameters as 1:1, then Session A goes through WAN1 then Session B will go through WAN2, the next session will return to WAN1 …
• Click Spillover to edit bandwidth threshold parameters
• Click Source – Destination IP to modify traffic parameters between interfaces included in the SDWAN interface
• Click Source IP to see activity based on the source address in the internal area out of the network

• View network traffic by SD-WAN Usage

Step 2: Configure create policy to make LAN traffic out of the Internet via SD-WAN Interface

• Policy & Objects -> IPv4 Policy -> Click Create New
• In Incoming Interface: Choose Port LAN
• In Outgoing Interface: Choose SD-WAN Interface that was created before
• In Source: Choose All
• In Destination: Choose All
• In Service: Choose All

-> Click OK to save

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