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This article describes that in FortiOS v7.4.2, an authorization check was introduced for iPerf clients, due to the utilization of the speedtest-server feature for ADVPN (Speed tests run from the hub to the spokes in dial-up IPsec tunnels). Thanks to that, it is no longer possible to test bandwidth between FortiGates as the speed-test check until FortiOS 7.4.8. Since FortiOS v7.4.8+, it is possible to run an iperf server locally, and a regular iPerf client can be used as well.
In FortiOS versions older than v7.4.8, the following error is returned when trying to run the iperf server:
fgtiperfserver_olderversion# diagnose traffictest run -s
iperf3: parameter error - cannot be both server and client
In FortiOS versions older than v7.4.2, the only possibility to run an iPerf server is by configuring and running the commands below:
config system global
set speedtest-server enable
end
config system interface
edit "port1"
set allowaccess ping https ssh http speed-test
next
end
And then run the following on a client FortiGate:
diagnose traffictest run -c <FortiGate server IP>
Or use an iPerf3 client:
iperf3 -c <FortiGate server IP>
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