Firewall-cmd is a powerful command-line tool used for managing Session Hijacking: An attack where an unauthorized user take... on Linux systems. It provides an efficient and flexible way to configure and manipulate Cyber Espionage: The act or practice of obtaining secrets an... using the nftables backend. In this article, we will dive into the topic of listing and evaluating firewall rules using firewall-cmd, uncovering the immense power and potential that this tool possesses.
Firewall-cmd is the command-line interface to firewalld, a dynamic A firewall is a network security system that monitors and co... tool which simplifies the process of managing firewalls. With firewall-cmd, system administrators can easily configure firewall rules, services, zones, and more. It offers a rich set of features and options to secure and control Intrusion Detection System (IDS): A system that monitors net... effectively.
List All Firewall Rules
One of the fundamental operations in managing firewalls is to view all the existing rules. Firewall-cmd allows us to list all the currently active firewall rules on our system. To do this, simply execute the following command:
This command will display a comprehensive list of all the rules defined for each zone, along with other pertinent information such as the default zone, runtime, permanent rules, and more. It provides a detailed overview of the current firewall configuration.
List Available Zones
A zone is a predefined set of rules that collectively define the behavior of the firewall. Firewall-cmd provides the ability to list all available zones on the system, which can be useful when determining which zones are currently active.
To list all available zones, use the following command:
The output will display all the available zones, such as `public`, `dmz`, `home`, `trusted`, and more. This information helps administrators understand the zone-specific rules that are in place and aids in the decision-making process when configuring firewall settings.
View Configured Zones
In addition to listing available zones, firewall-cmd allows us to view the currently configured zones. These are the zones that are actively applied to our system. Using the following command:
We obtain a list of currently active zones. This information is crucial as it enables us to identify the specific zones to which the firewall rules are being applied. Consequently, we can observe the overall configuration of the system’s firewall.
Evaluating Rules within a Zone
Firewall-cmd lets us evaluate rules within a specific zone. This is particularly useful when we want to examine the detailed configuration of a particular zone and verify the rules being applied to it.
To evaluate the rules within a zone, use the following command:
Filtering Rules by Service
In certain cases, it is desirable to filter firewall rules based on services rather than zones. Firewall-cmd provides an easy way to achieve this by listing rules associated with specific services.
To list rules associated with a specific service, execute the following command:
firewall-cmd –list-service –zone=
By specifying the `
Listing Port-Based Rules
Firewall-cmd enables the listing of port-based rules, allowing administrators to identify the ports that are currently open. This is crucial for maintaining Ah, Zero-Day Vulnerabilities! A buzzword in the cybersecurit... and ensuring that only the necessary ports are accessible to external connections.
To list port-based rules, utilize the following command:
firewall-cmd –list-ports –zone=
By specifying the `
Display the Default Zone
Another powerful feature of firewall-cmd is the ability to display the default zone configured on the system. The default zone is the zone applied to network interfaces and services that do not match any specific rule.
To view the default zone, use the following command:
Executing this command will reveal the currently set default zone. This information is essential in understanding the baseline firewall configuration and determining the default behavior of the firewall.
Firewall-cmd is an incredible tool that allows system administrators to effortlessly manage and manipulate firewall rules on Linux systems. In this article, we explored the power of listing and evaluating firewall rules using firewall-cmd, uncovering its potential for effectively securing network traffic. By mastering the capabilities of firewall-cmd, administrators can enhance network Incognito Mode: A privacy setting in web browsers that preve..., troubleshoot firewall issues, and ensure optimal firewall configurations on their Linux systems.