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Date: Fri, 27 Jun 1997 14:07:48 -0400 (EDT)
From: Alfred Perlstein <perlsta@fang.cs.sunyit.edu>
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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> I have the next problem:
> 
> When the "ipfw flush" comand is executed the system send me the message:
> 
> setsockopt failed

this is dumb, but are you root when you try this?

> 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?
> 

you need to specify the port to divert to :)
ie. from my machine:

/sbin/ipfw add 2000 divert 6668 all from any to any via ed0
			     |
this is the port number -----/

you should have a program listening to the port to manipulate the data
coming in.