Outbound Load Balancing and Failover (Auto Routing)
Load Balancing & Fault Tolerance
Note: Labeling the policies alone does not mean the policy has been set up. Configuring WAN link bandwidth must be
done under [System] -> [Network Settings].
Defining filters for the following:
1. When LAN users access web server on the internet, use policy "By Optimum Route" to route connections to the
best-conditioned link.
2. When LAN users access the FTP server on the internet, use policy "WAN1(512/512)" to route connections. If
WAN#1 fails, the connections will be routed "By Optimum Route". Note: In this case, "By Optimum Route" will only
route connections through WAN#2 as WAN #1 has failed.
3. The connections from 211.21.48.195 in DMZ to SMTP server on the internet will be routed by policy "WAN1
(512/512)". If WAN#1 fails, it will be routed by "WAN2 (1536/384)".
4. The connections from 211.21.48.195 in DMZ to POP3 server on the internet will be routed by "WAN1 (512/512)".
If WAN#1 fails, no action will be taken. Note: When WAN #1 fails, connection to the external POP server will also
fail.
Example 2
The auto routing policies to be established accordingly:
1. Always route connections through WAN#1 (fixed algorithm).
2. Always route connections through WAN#2 (fixed algorithm).
3. Always route connections through WAN#3 (fixed algorithm).
4. Route connections evenly among the three WAN links with "Round-Robin".
5. Route connections through the three WAN links by "Round-Robin" with weight ratio WAN#1:WAN#2:WAN#3 =
1:2:3. Note: if there are six connections to be established, the first connection will be routed through WAN#1, the
second and third through WAN#2, and the last three through WAN#3.
6. Route connections through WAN#1 and WAN#2 depending on the bandwidth left in the downstream traffic of
each WAN link.
7. Route connections through WAN#2 and WAN#3 depending on the bandwidth left in the total traffic of each WAN
link.
FortiWAN Handbook
Fortinet Technologies Inc.
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