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 From:  Jim McBeath <monowall at j dot jimmc dot org>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: Re: [m0n0wall] Problem setting up m0n0wall on a Single-NICmachine
 Date:  Sun, 11 Jan 2004 10:21:51 -0800
On Mon, Jan 12, 2004 at 12:19:55AM -0600, fred at daytonawan dot com wrote:
> You can't really use any firewalls I can think of with only one interface,
> simply because there wouldn't be much security there.  Although, you
> can use the same switch or hub or whatever for both interfaces and rely
> on layer 3 to separate your WAN and LAN networks.  I know that, because
> I'm doing it at present.  If for some reason you can't connect a second
> ethernet interface directly to your modem, you could leave it plugged in
> to the hub and connect your second ethernet interface to the hub as well.
> Either way, you really need a second ethernet interface on your m0n0 box.

This would be an interesting application for an interface alias ability in
m0n0wall.  That should give you the same functionality as using two NICs
connected to one hub.