Re: Traffic shaping

Steven Kurylo wrote:
> I'm looking for a traffic shaping solution which allows you to pool
> your available bandwidth for up or down use.

Half-duplexing a connection.

> That is, if I have a symmetrical 2Mb connection, I want either the up
> or down be allowed to use the entire 2Mb, but under load it would be
> shaped as needed.
>
> I know definitely that openBSD doesn't support this. You have to set
> the external interface to .5Mb to limit uploading and the internal
> interface to 1.5Mb to limit download. So if there isn't any
> downloading, the uploading will still cap at .5Mb wasting that
> precious 1.5Mb. Boo Urns.

I think the issue is that most network setups are full duplex; the
activity on the uplink does not (directly) affect the activity on the
downlink (note that DSL and cable modems have internal queues and HDX,
so this isn't true in that case). Wondershaper will specify traffic
caps for up and down, and also enable priority classes, but this is a
static activity based on estimates of usage.

I'm guessing what you would want is a userspace program that reads the
traffic activity and then shapes up/down the channels. You'd probably
have to write this yourself, because most people consider Wondershaper
the correct solution to this :)

Traffic flow management is a non-trivial networking problem. Good luck.
Received on Sun Jul 23 16:12:45 2006