From owner-freebsd-hackers@FreeBSD.ORG  Wed Feb 18 08:34:28 2009
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Date: Wed, 18 Feb 2009 08:34:24 +0000
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Subject: Simulating bad network conditions
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Hello.

I want to verify that a program I'm developing works correctly
in poor network conditions (high latency, random packet loss, etc).

I seem to remember reading something once about somebody simulating
these conditions with PF but can't remember where.

Anybody got any ideas about how I could go about doing this?

Ideally it won't involve starting up a hundred large BitTorrent
downloads and randomly ripping out network cables...

thanks,
xw