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Date: Thu, 26 Jun 1997 17:35:50 -0700
From: Julian Elischer <julian@whistle.com>
Organization: Whistle Communications
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To: Alejandro Galindo Chairez <agalindo@asimov.io.com.mx>
CC: questions@FreeBSD.ORG, isp@FreeBSD.ORG, hackers@FreeBSD.ORG
Subject: Re: ipfw: setsockopt failed
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> When the "ipfw flush" comand is executed the system send me the message:
> 
> setsockopt failed
> 
> or when i executed:
> 
> ipfw add divert 32000 ip from any to any via ed1     for example
> 
> the system send me the message
> 
> 00000 divert 32000 ip from any to any via ed1
> ipfw: setsockopt(IP_FW_ADD): Invalid argument
> 
>         Why? and How can i resolv the problem?
> 
> The system is a FreeBSD 2.2.1 of Walnut Creek CDROM

did you compile the kernel with
option IPFIREWALL
?