Theory: Short Summary
The Maximum bandwidth can be calculated as follows:
where RWIN is the TCP Receive Window and RTT is the round-trip time for the path. The Max TCP Window size in the absence of TCP window scale option is 65,535 bytes.Example: Max Bandwidth = 65535 bytes / 0.220 s = 297886.36 bytes/s * 8 = 2.383 Mbit/s.
We multiply the Byte per second times 8 to get the Bit per second rate. Over a single TCP connection between those endpoints, the tested Bandwidth will be restricted to 2.376 Mbit/s even if the contracted Bandwidth is greater.
Read more about this topic: Measuring Network Throughput
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