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Date: Tue, 21 Oct 2008 08:47:12 +0400
From: Roman Kurakin <rik@inse.ru>
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To: John Hay <jhay@meraka.org.za>
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Cc: "Leander S." <leander.schaefer@googlemail.com>, freebsd-ipfw@freebsd.org
Subject: Re: IPFW + Portforwarding
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John Hay wrote:
> On Mon, Oct 20, 2008 at 11:19:22PM +0200, Leander S. wrote:
>   
>> Hi,
>>
>> I'm trying to set up something like a HotSpot. Goal is it to force 
>> unregistred users to get redirected to the Captive Portalsite where 
>> they'll be able to agree my licence therms and get some information ... 
>> etc. ...
>>
>> So fact is I need an IPFW rule which forwards Port 80,443,8080 Traffic 
>> to another Port i.e. 8080 --> where my Apache will already wait for 
>> serving the Captive Portalsite back to the request.
>>
>> So I did read the man and saw something like the fwd rule and the Kernel 
>> Option for it - so I added the option - rcompiled the Kernel and gave my 
>> Firewall the following fwd rule in an extra script:
>>
>>       ${fwcmd} add 01100 fwd ${LAN_IP},8080 tcp from ${LAN} to any 
>> 80,443,8080 in via ${LAN_if}
>>     
Try to make the rule stateful, eq add 'setup keep-state'. Also add some 
logging in the rule
and add the last one additional deny with the logging.
> You have to catch it where it is going out and not in. Fwd only works
> when packets are out bound.
>   
But how this works for me?

ipfw  fwd 192.168.0.4,3128 log logamount 1000 tcp from 172.22.4.0/24 to 
172.22.4.254 dst-port 3128 setup in via vr0 keep-state

rik
> John
>