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Open Source IP Testing Tool?
winter@ES asks: "I'm looking for some "IP impairment" software for Linux. What I'd like is the ability to write some scripts that filtered/routed all traffic flowing through a box, with rules like 'For all traffic going to IP x.x.x.x, delay all frames by 400 miliseconds; reorder every 5th frame, and drop every 3rd frame.' There are remarkably few hardware/software solutions out there that I've been able to find to do this kind of thing, and the solutions that do exist are mostly targeted at backbone ATM-based networks. Anyone know of a nice open source tool for simulating poor network conditions?"
Dummynet is part of FreeBSD. It does exactly what you are asking for:
& apropos=0&sektion=0&manpath=FreeBSD+4.2-RELEASE&fo rmat=html
dummynet is a system facility that permits the control of traffic going through the various network interfaces, by applying bandwidth and queue size limitations, and simulating delays and losses.
Check out the man page:
http://www.freebsd.org/cgi/man.cgi?query=dummynet