Re: Upload speed greater than download speed
☄ Helpfulby gumu 2019/06/07 11:25:50
If you're load-balancing between two circuits and run a speed test with a server on the internet, likely it's testing only one side since the source&destination is a same set of IPs. But besides that I would run speed test by shutting down one ISP circuit to get a consistent measurable outcome.
Anyway, I have to assume like one ISP circuit is 80Mbps down/20Mbps up, and you get 0.1K-2Mbps down/16Mbps up in the speed test. Then most likely a duplex-mismatch is happening on the path between ISP circuit and your machine running the test.
There are many discussion in this forum about this subject. Search discussions with "duplex mismatch", and you can find the mechanism how it happens and how to find where the point(s) is(are). On the FGT side, to find how it's operating is "diag hardware deviceinfo nic <interface_name>". You always need to check on the other side as well.