From owner-freebsd-net  Fri Feb  1 10:20:18 2002
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Date: Fri, 1 Feb 2002 10:14:42 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
To: Marko Zec <zec@tel.fer.hr>
Cc: freebsd-net@freebsd.org
Subject: Re: ng_dummy - netgraph traffic shaping node
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hmm interesting...

any docs?
(we always include a man page when we commit a new node type.)

Any comments on netgraph in general


On Fri, 1 Feb 2002, Marko Zec wrote:

> The result of an innocent netgraph programming exercise can be found at:
> 
> http://www.tel.fer.hr/zec/BSD/ng_dummy/
> 
> "ng_dummy" is a simple traffic shaper node that implements control of
> traffic flow in both upstream and downstream direction. In each
> direction, the traffic flows through the sequence of two FIFO-type
> queues, which implement different queuing policies. The "inbound" queue
> is rate limited, and emulates an interface output buffer. On "outbound"
> queue, frames are dequeued based on preconfigured delay, thus emulating
> propagation effects on a transmission link. Additional features include
> random frame discarding based on BER; and emulation of phantom traffic,
> which competes for available bandwidth, and thereby introduces inbound
> queue congestions and delay jitter.
> 
> Have fun!
> 
> Marko
> 
> 
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