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Date: Tue, 12 Dec 2006 16:38:24 -0500
From: Bill Moran <wmoran@collaborativefusion.com>
To: "Bret J Esquivel" <besquivel@immense.net>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Routing Question
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In response to "Bret J Esquivel" <besquivel@immense.net>:
> 
> I have a cable modem at my office with a /28 allocated. I have a FreeBSD 6.1
> firewall/router in between the cable modem and the switch to other nodes. My
> question is how could I add static routes to say my web server having an
> external IP address but still going through the firewall box? NAT is not an
> option.
> 
> INET (70.164.48.225/28) -> [xl0] Firewall (70.164.48.226) [xl1] -> [xl0] Web
> server (70.164.48.227)

I could have swore that someone else recommended bridging, so I won't
bother to bring it up.

The other option is to set that system up as a router, and build a proper
routing table.  Your ISP will need to be involved so they know to route
traffic to your subnet through your gateway system.

You need to enable forwarding in /etc/rc.conf.  Then you'll need to
subnet your range properly.  Something like:

70.164.48.225/29 -> external 
70.164.48.241/29 -> internal

Then set your external interface on the router to 70.164.48.226 and
the internal interface to 70.164.48.242.  They you can use
70.164.48.243 - 249 on the inside.

Configuring the FreeBSD machine as a bridging firewall will simplify
the process, however, and is the approach I would recommend.

-- 
Bill Moran
Collaborative Fusion Inc.