[102118] in North American Network Operators' Group
Re: Cox clamping VPN traffic?
daemon@ATHENA.MIT.EDU (Bill Nash)
Sat Jan 26 12:58:07 2008
Date: Sat, 26 Jan 2008 10:50:23 -0700 (MST)
From: Bill Nash <billn@billn.net>
To: Ben Scott <mailvortex@gmail.com>
cc: nanog@nanog.org
In-Reply-To: <59f980d60801251730wa2b1699qf6c373a7ede200bf@mail.gmail.com>
Errors-To: owner-nanog@merit.edu
On Fri, 25 Jan 2008, Ben Scott wrote:
> I suspect this is just bursting/clamping, as you suspect, but you
> may also want to investigate traffic shaping at your end. I've found
> I get much better *receive* throughput if I limit my *transmit* rate
> to less than nominal maximum. Presumably, this has to do with the
> fact that the feed is asymmetric; I can receive much faster than I can
> send, and so the send channel becomes congested and that impacts TCP
> ACK or other protocol control messages.
If you're the Linux router type, check out Wondershaper. It's a simple set
of QoS tools, and it's literally a wonder. I can saturate my outbound on
Cox and still run ssh or play an FPS with no real hassle. Swapping to
something Linksys flavored the last time I took my firewall down for
hardware changes was actually noticeable.
- billn
