I'll see if I can paint a better picture here. We'll use IP's, let's
say
here is the setup.

Network 1

Internal Lan 192.168.x.x
BM 192.168.0.1 Priv
BM 204.76.0.140 Public

Network 2

Internal Lan 192.168.x.x
Firewall (other) 192.168.0.1 Priv
Firewall (other) 204.76.0.142

Lets say network 1 connects from 204.76.0.140 into a switch and
network 2
connects from 204.76.0.142 into the same switch. This switch then goes
to
a router at 204.76.0.139 and out to the internet.

If I wanted to filter traffic coming from network 2 from their
firewall
using BM, what would I need to do?