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From: Tom Marchand <m0rchand@comcast.net>
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Date: Fri, 21 Nov 2008 14:22:55 -0500
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Subject: IPFW Rule
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I am trying to add a IPFW rule to forward traffic but I keep getting  
the message "ipfw: getsockopt(IP_FW_ADD): Invalid argument".  The rule  
I am trying to add looks like this:

ipfw add 600 fwd 192.169.2.3, 6000 tcp from 192.169.2.3 to any 80

I do have IP Forwarding enabled.  Any ideas what I am doing wrong?