Subject: Re: Transparent Firewall w/ NetBSD
To: David Brownlee <abs@netbsd.org>
From: Jon Lindgren <jlindgren@espus.com>
List: netbsd-help
Date: 07/18/2000 10:11:24
On Tue, 18 Jul 2000, David Brownlee wrote:
[snip]
> > Now, since I have no control over the routes on their network, I can't
> > implement a BSD box which routes and firewalls; this would require
> > the provider to use that box as the gateway for my 10 static IP
> > addresses. In otherwords, I'm stuck on a flat topology.
> >
> Not really - you can setup IP aliases on the external interface
> of the NetBSD box, and setup appropriate NAT rules to map your
> internal addresses to your external ones. It allows you to play
> extra games with changing the mappings as and when you want.
Definitely one solution. I guess I'm trying to point out the differences
of a layer 2 vs. layer 3 solution. When I can't mess with layer 3 without
going through hurdles, a layer 2 solution is a nice, clean
alternative. Especially in a larger situation with, say, a class C
subnet. 255 aliases on a single interface! That'd be something to be
proud of [in an odd sort of way ;-]
> > Solution: a bridging firewall.
>
> One solution - good use of NAT is another one.
Aside all of this, am I wrong about NetBSD lacking bridging support?
I seem to remember that people talked a bit about it a while ago, but I
haven't tracked -current in a while so I'm not on the bleeding edge.
Take care,
-Jon
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