Long-haul 100Mbps EPL circuit throughput issue

Pablo Lucena plucena at coopergeneral.com
Fri Nov 6 05:17:26 UTC 2015


>
>
> Modern TCPs support and typically use window scaling (RFC 1323). You
> may not notice it in packet dumps because the window scaling option is
> negotiated once for the connection, not repeated in every packet.
>
>
Absolutely. Most host OS should support this by now. Some test utilities
however, like iperf (at least the versions I've used) default to a 16 bit
window size though.

The goal of my response was to allude to the fact that TCP relies on
windowing unlike UDP, thus explaining the discrepancies.

This is a good article outlining these details:

https://www.edge-cloud.net/2013/06/measuring-network-throughput/



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