Perhaps this will help.

pkg-descr: A little program to bounce tcp connections to another
By default it listens on port 1523.

rinetd redirects TCP connections from one IP address and port to another.
rinetd is a single-process server which handles any number of connections to
the address/port pairs specified in the file /etc/rinetd.conf. Since rinetd
runs as a single process using nonblocking I/O, it is able to redirect a
large number of connections without a severe impact on the machine. This
makes it practical to run TCP services on machines inside an IP masquerading
firewall. rinetd does not redirect FTP, because FTP requires more than one
socket. rinetd also supports basic allow/deny access control and logging.
Good Luck!

----- Original Message ----- 
From: "Tech Support" <[EMAIL PROTECTED]>
To: "freebsd-questions" <[EMAIL PROTECTED]>
Sent: Tuesday, October 07, 2003 4:14 PM
Subject: Gateway / Port redirection

> Background
> I am currently running freeBSD 4.8 on a box as
> a) a gateway for the house for internet access on dialup permanant IP
> , domain etc
> b) using apache for a web server hosting a domain and virtual domains
> c ) Qmail for mail
> d ) Squid proxy for the childrens computers access ( saves on
> bandwidth )
> e) ProFtp as FTP Server
> f ) DNS
> g ) Ssh
> h) All on a dial up account
> i )  port Sentry
> j ) etc
> I need to run a couple of programs inside the lan where ports are
> directed to them from outside  the lan  eg all the above services are
> located on the Bsd box ( 192.168.x.x ) and i need to direct port 5060
> to ( for arguments sake )
> Not being very knowlegable about the inner workings of FreeBSD ( but
> learning slowly ) I have decided that seeing as this is really only a
> temporary exercise ( perhaps a month , and to compound everything in a
> couple of months the BSD box will also be shifting to broadband ),
> that I would use FreeSCO ( as a NEW gateway / port
> redirector .  I am going to forward my current services above to my
> current BSD box and the NEW PORTS direct to the Win box(s) that I need
> to test this software on . My thoughts were to leave the current
> gateway as  and the FreeSCO box name it . I
> would like to direct outbound web surfing via the BSD box as current
> as it would be a PITA to change all the machines on the LAN
> My question(s)
> a) is this overkill ( is there an EASIER way to do what I want ( port
> redirecting ) ( bearing in mind that although the lights are on in the
> attic they are at times low wattage :-)  )
> b ) WHAT do I need to change on my BSD box ( rc.conf  etc ) to make it
> work the way described ? Remembering that this is only temporary .
> Thanks in advance for any advice
> Regards
> Benny
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