Using dummynet to restrict bandwidth with more than 2 active pipes / queues

[Mark Sandford]

It's a home grown tool using libnet.

We've re-tested using one packet generation process to create 4 flows going across the four pipes and see pretty much what we were expecting.

In this case we were just firing 1000 byte udp packets (1042 bytes on the wire).

~~~~~~~~~~~~~~~~~~~~~~~~
Mark Sandford

email: j.m.sandford at hotmail.co.uk
mob: 07990 565976

~~~~~~~~~~~~~~~~~~~~~~~~






> Date: Mon, 27 Jul 2009 23:22:06 -0700
> From: julian at elischer.org
> To: j.m.sandford at hotmail.co.uk
> CC: freebsd-ipfw at freebsd.org
> Subject: Re: Using dummynet to restrict bandwidth with more than 2 active pipes / queues
> 
> Mark Sandford wrote:
> > Sorry if anyone's wasted time looking at this. The problem appears
> > to be with the traffic generator. Once we get above two generation
> > processes we think that the data is being sent in bursts so although
> > it appears to be right averaged over a second at a finer granularity
> > the burstiness is meaning it's either exceeding the bandwidth or idle
> > at each point.
> > 
> 
> what are you using to generate traffic?
> and what kind of traffic?
> 
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