Since I was hacked, I am now trying to re-build my little company network. I have 5 Workstations and 3 servers. I was using Microsoft Servers without a firewall.
I still don't have enough money to buy a dedicated Firewall appliance, so I decided to install a Linux Firewall directly to the Internet so any connection to our Public IP goes through the Firewall first. My intention is that the firewall should have 2 NIC's one to connect to Internet and the other to a Gigabit switch that connects to our machines.
I started installing a CentOS7 Linux, then enabled the Firewalld software. Now, I want to make this Linux box as a DCHP and DNS server.
Can someone helpme to do it? (I have tried several tutorials on the net but nonething has worked yet)