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Learn about some of the best-known open-source firewalls based on Linux to protect networks and computers from cyber security threats. 

We need a well-configured Firewall, which is a key component of network security when we are about to expose our internal network to the outside world. Although our operating systems come with some kind of firewall software, however, they are not enough to protect each device of a network. Hence, we need a dedicated Firewall. The advantage of open-source firewalls is that it is completely free and there are no verifiable backdoors because the open-source firewall code is known and has a good reputation. It usually takes a little longer to install and configure this, but this technology is worth a closer look and is worthwhile.