On 4/4/06, Brian McEntire <brian dot mcentire at gmail dot com> wrote:
>
>   Can M0n0wall act as a bridging firewall? Saw on the list there was a patch
> for this but hoping this is now integrated into the official release.
>

long ago.

this should be precisely what you want:
http://doc.m0n0.ch/handbook/examples-filtered-bridge.html


>   Other than a bridging firewall, is there another way to approach this
> using Monowall?

I can't really think of any other firewalling scenario that would
nicely fit this situation, where you don't control the other network. 
Bridging is easy and clean as long as you have one Ethernet uplink
back to that other network.

-Chris