Unix friendly network testbench for FreeBSD?

[Chuck Swiger]

youshi10 at u.washington.edu wrote:
> Hi,
>      I'm looking for a network testbench / simulator to stimulate known 
> networking conditions to test out a component for a product at work.
>      I was wondering if there was a network simulator available 
> (preferably open source) that's FreeBSD / Linux compatible which I can 
> simulate as real of a network as possible on a virtual machine / network.

Dummynet or ALTQ might be good starting points, as is netgraph, depending on 
just what you're trying to do.  There are also userland benchmark/analysis 
tools like flood pinging, netperf, & ab ("apache bench").

-- 
-Chuck