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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: ISO simple non-forking TCP connection forward/balance tool
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Chris Peiffer wrote:
> 	
> I'm looking for a simple program I can use to forward incoming TCP
> connections to several other addr:port pairs. (including one on the
> machine itself.) Holding the connections open and passing the data
> back and forth until both parties close their ends.
> 
> I need a solution that doesn't fork. One way to do it is just fork
> ad-hoc netcat pipes with inetd, but I'm trying to avoid the process
> overhead.

See net/bsdproxy.