I would suggest this article:

http://www.daemonnews.org/200103/ipf_bridge.html

it gives good information about setting up OpenBSD as a bridge. Setting
OpenBSD up as a bridge allows you to configure ipf for firewalling, and
also lets you put the firewall in invisibly to the network. In essence a
bridge is a very smart wire that kills unwanted packets.

For the traditional, and generic, IPF/IPNAT documentation, here is a link
to the OpenBSD FAQ:

http://openbsd.org/faq/faq6.html#6.2

        -Aaron
          Crandall

"All Windows XP users will get a Passport," Ballmer said.
"For which country?" Aaron asks.

On Tue, 24 Apr 2001 Joe.Warnersmed.com wrote:

> Hi,
>
> I've just installed OpenBSD 2.8 on a Compaq
> Deskpro via a boot floppy and ftp.
>
> I need to configure this PC as a good firewall
> because our office recently got a new internet
> connection (T1) and it's currently being routed
> through a WIN2K machine and this scares me.
>
> I need to get this set up in a hurry.
>
> This is my first experience with OpenBSD and
> firewalling. I do have over a years experience
> using FreeBSD 3.4 & 4.2.
>
> Can anyone point me to some good documentation
> that goes into the specifics of configuring a firewall
> with OpenBSD? I've already read through the FAQ
> and installation docs from the main web site. I've
> searched on the web and couldn't find anything
> specific enough.
>
> I need to add a second NIC card for the internet
> and finish the rest of the configuration.
>
> Any help/info would be greatly appreciated.
>
> Thanks
>
> Joe
>
>
>
>
>
>
>

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