[102113] in North American Network Operators' Group
RE: Cox clamping VPN traffic?
daemon@ATHENA.MIT.EDU (Justin M. Streiner)
Sat Jan 26 01:41:20 2008
Date: Sat, 26 Jan 2008 01:31:38 -0500 (EST)
From: "Justin M. Streiner" <streiner@cluebyfour.org>
To: nanog@nanog.org
In-Reply-To: <70D072392E56884193E3D2DE09C097A9EE23@pascal.zaphodb.org>
Errors-To: owner-nanog@merit.edu
On Fri, 25 Jan 2008, Tomas L. Byrnes wrote:
> The throttling I am talking about occurred on business class service
> which is rated at 16Mbps/2Mbps and is NOT cheap. I'd love to know what
> the throttling mechanism Comcast uses is, as Cox swears up and down that
> they have no such thing in place. That both got throttled to the EXACT
> SAME, non multiple of a DS0, is just a bit too coincidental for me.
>
> If it was some sort of trunk capacity or mux issue, I would expect the
> BW I was left with to be a multiple of 64Kbps or 1.544 Mbps, not some
> odd-ball number like 43Kbps.
Could it be that the provider is silently inserting RSTs into live flows?
This is not unheard of and would have the capability to send throughput
into the toilet.
Before walking down that road, however, are you sure you're not dealing
with an MTU/TCP-MSS/DF bit issue?
jms
