Without your ISP's cooperation, you'll have to use "proxy" servers to
accomplish this.  Proxy servers gateway individual TCP connections
so that each connection to the inet is coming from the same address.

Slirp is another option, actually,now that I think about it.  You'll
have to use serial connections to the gateway host,or else find a way
to port SLIRP to use a network connection.
> 
> 
> In Regards to your letter <Pine.OSF.3.90.960814081848.5682A-100000@theta.math.wsu.edu>:
> 
> > I want to SLIP/PPP my BSD box into an ISP, then use the unix box as a
> > gateway allowing three other machines (2 DOS/Win, 1 MacOS) to directly
> > access the net. 
> I assume your service provider will only provide one address with no
> routing, possibly a dynamic address.  In such a case your other systems
> would be isolated from the Internet.  
> 
> You should look at the FWTK HOWTO FAQ on, I'm not sure, www.netbsd.com or
> on puma.bevd.blacksburg.va.us.  
> 
> Another option might be SLIRP, which allows shell logins to get dialup
> IP access.  I do not know where this is located, but it shouldnt be too
> hard to find, I have run into pointers to it more than once over the past
> couple months.  
> 
> I have also been thinking about doing something similar, but just havent
> had the free time to try to set it up yet.  
> 
> Good luck and copy me with your progress if successful,
> 
> ___________________
> Michael L. Kornegay
> Internet: mlk@mlksys.atl.ga.us
>