Hi all, I really need your help on this if you can...

I am trying to put set up port forwarding on my machine. So far the usual 'add 
allow' and 'add deny' rules work perfectly. The most important rule which bugs 
me is the 'add fwd' rule, which the snippet below shows:
ipfw add fwd 192.168.0.4,80 tcp from 10.10.10.0 to any 80

When I try to enter this on the command line, I get the following error:
 ipfw: getsockopt(IP_FW_ADD): Invalid Argument 

I tried researching the web. Some mention the error only upon recompiling 
kernels. But I am using the standard 5.4 product release as-is. My firewall 
rules in rc.conf are as follows:
firewall_enable="YES"
firewall_logging="YES"

I also have this line in dmesg:
 ipfw2 initialized, divert disabled, rule-based forwarding disabled, default to 
deny, logging disabled

I see that 'rule-based forwarding' is disabled. Is this what caused the error? 
How can I enable it? I can't find the details on the Handbook.

Please advise. Thanks.
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