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Date: Wed, 15 May 1996 09:55:09 -0600
From: Nate Williams <nate@sri.MT.net>
Message-Id: <199605151555.JAA19142@rocky.sri.MT.net>
To: Garrett Wollman <wollman@lcs.mit.edu>
Cc: Kristyn Fayette <kristyn@gnu.ai.mit.edu>,
        questions@FreeBSD.ORG (FreeBSD Questions)
Subject: Re: Networking / Routing question
In-Reply-To: <9605151437.AA16587@halloran-eldar.lcs.mit.edu>
References: <199605142231.SAA15402@spiff.gnu.ai.mit.edu>
	<9605151437.AA16587@halloran-eldar.lcs.mit.edu>
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> >                                                ed1       ed0
> >                         x.x.x.253        x.x.x.252       x.x.x.251     x.x.x.35
> 
> BZZZT!
> 
> IP subnets must be fully connected.  You cannot have the same subnet
> on two different logical wires.

I figured as much.  How would you suggest doing the following.

Background:

I will have a 32 host IP subnet, where I am using about 23 IP addresses
right now.  I'd like to add a firewall box on one end of the link
connected to router.  So, I have 2 machines on one-subnet, and the rest
of my network on the other subnet.
                          ethernet            ethernet
[ Internet ] <--> Router <--------> Firewall <--------> My machines

Since I only have 32 IP addresses available I don't want to waste any IP
addresses if I can help it, especially considering I expect to use a few
more addresses beyond the 23 I have now.

Since I have two ethernet segments, I must have two different subnets,
but I don't see any easy solution to the problem.  It would be nice if I
could use the ethernet segment as a point-point connection in this case
(for latency & BW ethernet is the cheapest way to go).

What would you suggest?


Nate