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Article #132

Re: Modem Sharing

#132
From: mjcr
Date: Mon, 16 Oct 2000 00:00
33 lines
2649 bytes
Thomas Baumgartner <tbaumgar@klbg.n.redcross.or.at> wrote in message
news:39EAD8E0.8A295F24@klbg.n.redcross.or.at...
> I have a 486 machine with a modem connected to the internet. Then there
> is my laptop connected to the 486 via parallel nullmodem cable (or
> serial nullmodem cable). Now I want to access the internet with the
> laptop via the modem connected to the 486. Has anyone tried such a thing
> and how can it work.
> One Idea is to find a program which runs on the 486 which sends all it
> receives at the com-port connected to the laptop to the com-port
> connected to the modem and vice versa (so that the 486 with the modem
> appears to the laptop as a normal modem). Does anyone know a program
> which can do this?
> A more elegant version would be the use of  a program like Wingate or
> so. But the problem is that all these programs (as far as I know) need a
> LAN on the private network side.

What operating system(s) are you using?  Depending on the operating system
what you desire could be a trivial task.  The laptop and the internet
connected desktop(?) computers could be networked via their serial ports or
parallel ports.  Via the serial ports you could setup a SLIP (serial line
IP) or PPP (Point-to-Point Protocol) connection.  Via the parallel ports you
could setup a PLIP (Parallel Line IP) connection.  Either way you would have
a local two computer IP network using these interfaces for your network
interfaces.  The laptop would be setup as an ordinary host and the desktop
would be your router.

The laptop would not hae to know anything about the modem it would just know
that it would have to send all of its network packets to the router which
would be its gateway.  If you are using dynamic IP address on your rouer to
connect to the internet, the router would have to masquerade the packets
that it is forwarding from the laptop.  Again, depending on the operating
system this can be trivial.
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From: <mjcr@mindspring.com>
Subject: Re: Modem Sharing
Date: 2000/10/16
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