This page primarily covers how to use Ettercap to build a bridge between two network devices that can be sniffed.

Build Bridge

Software

Install bridge utilities, allowing you to bridge network devices:

$ apt-get install bridge-utils

Both network devices need to be configured as open IP addresses, by setting them to 0.0.0.0.

Assuming the two devices are a wireless card wlan0 and an ethernet connection eth0, this would look like:

$ ifconfig eth0 0.0.0.0 up
$ ifconfig wlan0 0.0.0.0 up

We'll add a bridge, and add endpoints to the bridge.

$ brctl addbr lucifer
$ brctl addif lucifer eth0
$ brctl addif lucifer wlan0

Finally, we can raise the bridge:

$ ifconfig lucifer up