and we are ready to implement it!
If you’re directly connected to the internet and don’t have a firewall, your computers are being pounded by botnets and hackers on a daily basis. If you’re running Windows computers, they will get in sooner or later, but even Macintosh and Linux systems can leave you vulnerable although the latter one is probably the best bet in terms of security. A firewall is the solution to having control over the situation.
While commercial “hardware” firewalls may sound better, the fact is that they’re not.
https://doc.pfsense.org/index.php/Comparison_to_Commercial_Alternatives