Technical Tip: How to perform the WAD source affinity exempt for specific source address

[fquerzo_FTNT]

Description

This article shows how to perform the WAD source affinity exempt for specific source address.

Scope

FortiGate.

Solution

When wad-source-affinity is enabled, the WAD traffic dispatcher allows incoming traffic to be directly distributed among the WAD workers. 

config system global

    set wad-source-affinity enable

end

When users are behind NAT device then the traffic from the NATed source IP would be forwarded to only one WAD worker and can load that WAD worker. This can also happen when there are high number of sessions received from few sources.

It is also possible to use the below commands to exempt these source addresses from proxy affinity, which allows traffic from the same source and different server to be distributed to WAD workers in a round-robin configuration.

config web-proxy global

set src-affinity-exempt-addr <IPv4 address> ...

set src-affinity-exempt-addr6 <Pv6 address> ...

end

Note : These commands are valid for FortiProxy. Tested and verified on the LAB.