> On Mon, Jun 10, 2002 at 04:10:41PM +0000, Jeff Flowers wrote:
> > I currently connect to the Internet via a cable modem using DHCP. My
> > wife's computer uses a modem and connects via Earthlink. Because of
> > excessive telephone line noise, she wants me to hook her computer up
> > to the cable modem so that she will have a better connection.
> 
> Thanks to everyone who has responded. I may have a different way to
> fix this, however.
> 
> Would it be possible to connect her computer and mine via PPP over a
> null modem cable and have that connection route out to the Internet?
> I am asking because I have access to a free null modem cable if I
> want it.

Connect machine A to machine B via ppp (over null modem cable on tty ports)
is no problem.  You still have to have either machine A or machine B connected
to the Internet (via cable modem) and routing some packets to the other machine.  
That is still, most likely, NAT and ipf.  One of those machines needs to act like a
router/firewall to connect both machines, simultaneously, to the cable/internet.

Or am I misunderstanding your problem?

Paul