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

  • From: Bill Nash
  • Date: Sat Jan 26 12:59:03 2008

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