Most firewalls (software and hardware included) come with pre-configuration settings. Still, it’s better you check its settings and see if they fit your needs. The main steps for a firewall configuration are: 1- Secure your firewall and update​ it ​to ​the ​latest security features. 2- You should also delete or disable default user accounts, and change default passwords. 3- Define firewall zones and IP addresses. 4- Craft your network structure and make sure you’ve grouped assets and placed them into networks (or zones) based on similar functions. 5- Create firewall rules, known as access control lists (ACL), and choose which traffic needs permission to transit into and out of each zone.