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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Tom Marchand <m0rchand@comcast.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: IPFW Rule
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>> rule looks OK, but your message clearly suggest you DO NOT have IP 
>> forwarding enabled
>
> Interesting sysctl reports that forwarding is enabled:
>
> $ sysctl -a |grep forward
> net.inet.ip.forwarding: 1
>
it's not that. it's about routing, not ipfw forwarding

you need

IPFIREWALL_FORWARD

option in kernel.