I have Ubuntu 14.04 installed on my system and I make it as a server in my office with having 15 employees working. I have 2 LAN cards in my system:
- One for input from router to my Ubuntu server
- Other one from my system to a switch, which connects all my employees from through that switch via LAN cables.
Now, how can I configure my both LAN cards, as I wants to block some sites and make some restriction on the network.