Long-haul 100Mbps EPL circuit throughput issue

William Herrin bill at herrin.us
Fri Nov 6 04:40:22 UTC 2015

On Thu, Nov 5, 2015 at 9:17 PM, Pablo Lucena <plucena at coopergeneral.com> wrote:
> With default window size of 64KB, and a delay of 75 msec, you should only
> get around 7Mbps of throughput with TCP.

Hi Pablo,

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.

Bill Herrin

William Herrin ................ herrin at dirtside.com  bill at herrin.us
Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>

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