[175762] in North American Network Operators' Group
Re: Comcast throttling?
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Fri Oct 31 16:45:42 2014
X-Original-To: nanog@nanog.org
To: Mark Price <mprice@tqhosting.com>
In-Reply-To: Your message of "Fri, 31 Oct 2014 15:41:43 -0400."
<CACBmxzf1wD8fzDkzOM4bx=DO2GiQoS0vO-m0eYCjD+aoDpFSyg@mail.gmail.com>
From: Valdis.Kletnieks@vt.edu
Date: Fri, 31 Oct 2014 16:45:27 -0400
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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On Fri, 31 Oct 2014 15:41:43 -0400, Mark Price said:
> Similar to another thread on the list today, I'm troubleshooting a problem
> for a customer on Comcast business fiber.
>
> Downloading a file from one of our web servers is very slow (~15KByte/sec).
I recently hit a similar problem, tracked it down to a brain-dead firewall
owner that had configured the gear to change the TCP WSCALE header option to
NOPs. Hilarity ensues when the sender thinks the window is 389 bytes rather
than 389<<10 bytes.
Yes, you *would* think that sort of tomfoolery went out with the last century,
but it's amazing how long people will re-invent bad ideas....
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