North American Network Operators Group
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RE: Cox clamping VPN traffic?

  • From: Justin M. Streiner
  • Date: Sat Jan 26 01:42:23 2008

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