Transparent proxy using IPFW

[kalpin at muliahost.com]

Hello,

> 2009/11/30 <kalpin at muliahost.com>
>
>> Dear All,
>>
>> Is it possible to do like my requirement below?
>>
>> 1. Setup portfwd in my server listen on port 555 and forward all
>> connection through this port to another server with same port or
>> different
>> port
>> 2. All client which connected through this port, then remote server
>> which
>> landed to the end can see the client's IP.
>>
>> example:
>>
>> Client IP: 202.15.15.16
>> FreeBSD IP: 202.16.17.18 listen on port 555
>> Remote Server IP: 202.89.89.90
>>
>> Client IP connect to 202.16.17.18 on port 555, and then FreeBSD forward
>> it
>> to 202.89.89.90 with same port or different port. Server with IP
>> 202.89.89.90 can see Client's IP 202.15.15.16.
>>
>> I am using FreeBSD 7.2-stable.
>>
>> Thank you
>>
>> Kalpin Erlangga Silaen
>>
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>
> you can but you will need to do some natting otherwise the return traffic
> will go direct to host a from c and not via your box host b
>
> or you could use nc via inetd
>
> eg
>
> some_service             stream  tcp     nowait  root
> /usr/local/bin/nc      nc -n -w 3  hostC port_on_hostc
> _______________________________________________

I tried install rinetd, but it looks the IP come from the server not
client's ip. Also, I tried portfwd and portfwd need transparent proxy in
kernel. How do I enable this?

Need your advice.

Regards,

Kalpin Erlangga Silaen