Cox clamping VPN traffic?

Bill Nash billn at billn.net
Sat Jan 26 17:50:23 UTC 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



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