From owner-freebsd-ipfw@FreeBSD.ORG  Fri Sep 23 18:38:50 2005
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Date: Fri, 23 Sep 2005 19:41:03 +0300
From: vladone <vladone@spaingsm.com>
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Subject: Re: Enable ipfw without rebooting
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U can use:
ipfw enable or ipfw disable command (man ipfw)

or from sysctl:
sysctl net.inet.ip.fw.enable=0 (to disable)