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Date:      Mon, 04 Jan 1999 02:59:39 -0800
From:      David Greenman <dg@root.com>
To:        xiyuan qian <xiyuan@dns.hgs.com.cn>
Cc:        isp@FreeBSD.ORG
Subject:   Re: How to transfer the tcp socket connection? 
Message-ID:  <199901041059.CAA24307@implode.root.com>
In-Reply-To: Your message of "Mon, 04 Jan 1999 17:55:19 GMT." <199901041755.RAA08104@dns.hgs.com.cn> 

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>Hi, I have a host acts as a gateway with two NICs. Now, I need to let my client
>to connect to the outside through this host. That is when I enter:
>telnet gateway-host 1234, then the gateway host will auto make this connection
>to the 1234 port of one outside host. 
>
>For example:
>  
>Inside: 10.10.10.10 (client) 
>Gateway-host: 10.10.10.1 and 202.100.100.1
>Outside: 202.100.100.100
>
>Now, I enter telnet 10.10.10.1 1234 at the 10.10.10.10 host, then the 
>connection will auto be made to 202.100.100.100 1234.
>
>How to carry this out?

   You appear to be describing a need for network address translation. We have
a thing called "natd" which will do this for you - in your case, you would
probably want to set it up for static translation of the two addresses. See
the manual page for natd...

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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