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What is Firewall?A firewall is a computer network security system that restricts incoming, outgoing Internet traffic. This software or hardware drive works by blocking or allowing the transit of data packets. Firewalls are comparable to fences or gates that manage the transit of web activities.
Firewalls create “bottlenecks” for Web traffic. The data flow is examined based on a set of programmed parameters. A firewall decides which network traffic can pass and which is dangerous. It essentially separates good from bad or reliable from unreliable.
What are the types of firewalls?
Network Firewall > Let’s start with a basic type of firewall. A network firewall protects a system from unauthorized access by external threats. They can be hardware or software depending on your needs.
Circuit Level Gateway > This firewall controls the handshake between systems and checks if the session is legitimate. Otherwise, it will not allow and all unnecessary and unauthorized sessions are thrown away.
Application Firewall > Supervises input/output and access to/from any application or service. Blocks input/output or system service calls that do not fit the firewall policies set by the administrator. It is also known as proxy or reverse firewall proxy.
Firewall with status > This firewall, mind you, is the combination of all firewalls. It’s a handyman. It monitors the status of connections within it.
Method to disable/enable firewall on Kali Linux: First, we set the firewall in Kali Linux. We can use the command to create a firewall in Kali Linux because it is not preinstalled. UFW is a simple Linux firewall administration software that tries to provide a user-friendly interface.
$ sudo apt install ufw
Firewall has been successfully deployed and we can now use the status command to check its status.
$ sudo ufw status 
Currently, the status is “inactive”. You can reactivate it by running the command below.
$ sudo ufw enable
Now, the status is “Active”. You can use the disable command to disable it. Run the following instruction in the Kali Linux terminal to disable the firewall:
$ sudo ufw disable
PS: I hope this content was useful and thank you for reading:)
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