[185674] in North American Network Operators' Group
Re: Long-haul 100Mbps EPL circuit throughput issue
daemon@ATHENA.MIT.EDU (William Herrin)
Thu Nov 5 23:40:50 2015
X-Original-To: nanog@nanog.org
X-Really-To: <nanog@nanog.org>
In-Reply-To: <CAH+2GVLSUYMo-XGdQc1knYEq1hA13=NOQf4jP=2fiNFMQoC5aw@mail.gmail.com>
From: William Herrin <bill@herrin.us>
Date: Thu, 5 Nov 2015 23:40:22 -0500
To: Pablo Lucena <plucena@coopergeneral.com>
Cc: NANOG Operators' Group <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Thu, Nov 5, 2015 at 9:17 PM, Pablo Lucena <plucena@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.
Regards,
Bill Herrin
--
William Herrin ................ herrin@dirtside.com bill@herrin.us
Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
