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RFL5 was released somewhere 2002ish I think so it used a 2.6 or 2.4 kernel and the userland tool is then called "iptables" (preferable) or "ipchains" (more of a kernel 2.4 thing though you can probably still use it).
"ipfwadm" was a 2.0 kernel thing and is deprecated.
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I can't find ipfwadm
