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Re: Network stress testing tools

Thor Lancelot Simon <> writes:

> On Wed, Aug 14, 2013 at 06:43:23PM +0200, Jean-Yves Migeon wrote:
>> Hi list!
>> I am looking for a library or set of tools I can integrate in a
>> project to "simulate" a typical network behavior: latency(ies),
>> packet lossage, out of order sequence, etc.
> How can you do this using the public system call interface?  TCP will
> obscure many or even all of the issues you describe above...

So there are two separate issues:

  a socket-level tool to represent the kind of delivery timing that TCP
  would have given packet-level impairments.  (This sounds hard, and I
  would not be inclined to do it.)

  a packet-level tool like dummynet from FreeBSD, but somehow hooked
  into tap/tun/etc. or via rump, so that it can appear to be a
  less-than-first-class wire

I'd be inclined to make something that can be a virtual network between
two rumps, with tunable impairment.  Perhaps dummynet code can be
ported, but it doesn't seem that complicated.

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