Consider the following things :
- CASE 1: If you use eth0 as input interface and wlan0 (connected to your existing Wifi) as output interface or vice versa, input and output subnets will be physically splitted.
- CASE 2: If you use eth0 as input and output networks, input and output subnets will be in the same physical network.
- CASE 3: If you use Keexybox as Access Point, that mean you must use a new interface called "br0" for input and output networks and it will be the same case as CASE 2.
- CASE 1: If you use eth0 as input interface and wlan0 (connected to your existing Wifi) as output interface or vice versa, input and output subnets will be physically splitted.
- CASE 2: If you use eth0 as input and output networks, input and output subnets will be in the same physical network.
- CASE 3: If you use Keexybox as Access Point, that mean you must use a new interface called "br0" for input and output networks and it will be the same case as CASE 2.