Hi all,
Iperf version – iperf 3.1.3
My set up: iperf server (GCE) <=> Gateway VM (GCE) <=> IPsec server (GCE) <=>
WAN <=> Laptop with IPSec Client
My test:
Server – iperf3 -s
Client – iperf3 -c <server ip> -P 15 -R -w 768k
Due to IPsec header, my Gateway VM modifies the MSS size of the SYN-SYN/ACK
message so that the TCP segments are not fragmented after IPSec ESP encryption.
My Observation:
When I perform a downlink test by using the “-R” option at the iperf client
side, my throughput has a lot of variation and quickly drops to 1 or 2 Mbps. In
other words, the iPerf server reduces the rate at which it pumps data. There
are no packet drops on other VMs in my setup.
I want to understand how iperf server determines the rate at which it has to
pump data?
Thanks and regards,
Rajesh K
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