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Date:      Tue, 01 Jul 1997 09:16:36 +0300
From:      Nadav Eiron <>
Cc:        freebsd-questions <freebsd-questions@FreeBSD.ORG>
Subject:   Re: Question: using the Non-Assigned IP numbers and routing
Message-ID:  <>
References:  <>

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Robert wrote:
> Another question.
> If I have a fbsd machine, attached to an ISP, with an assigned
> IP provided by the ISP, how do I set up those 196.x.x.x IP numbers
> on my "internal" route so that the machines on the internal net
> can all see through the fbsd machine and out to the Internet,
> and so the internet can send email in to the machines on the
> internal net, without the internal net numbers being visable
> to the Internet at large. Which of course they shuldn't be.
> Thanks for any pointers here. routing confuses the hell out of me!
> cheers,
> Bob
> --
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First, the block of unassigned (private) C-class addresses is
192.168.x.x. Next, what you're looking for is generally called IP
aliasing or NAT (Network Address Translation). If you're using a dial-up
connection on your FreeBSD machine, read the ppp tutorial at

If not (i.e. you have a fixed connection adn a router, and you use
FreeBSD as an internal router or as a firewall), take a look at the IP
aliasing tutorial, as well as the docs for natd.


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