Blog Blog Posts Business Management Process Analysis

What is Packet Filtering Firewall?

Packet Filtering Firewall

A packet filtering firewall is a network security technique that regulates data flow to and from a network. It is a security mechanism that allows packets to move across networks while controlling their flow through the use of a set of rules, protocols, IP addresses, and ports.

Let’s have a quick glance at the topics to be covered in this blog:

Points to Dwell Over:

Before we dig up deep into the realm of Packet Filtering Firewalls, it’s better to understand what the term “Firewall” means.

For a better understanding, make sure to have a look at the visual explanation of

What is a firewall?

A firewall is a network security device that monitors and filters incoming and outgoing network traffic in accordance with previously established security policies in an organization. A firewall, at its most basic, is a barrier that sits between a private internal network and the public Internet. The primary function of a firewall is to keep dangerous traffic out while allowing non-threatening traffic in.

Types of Firewalls

Firewalls are classified as either software or hardware firewalls, depending on their structure. Each type of firewall serves a distinct purpose while providing the same functionality. However, having both is recommended for maximum protection.

Furthermore, there are numerous other types of firewalls based on their features and level of security. Firewall techniques that can be implemented as software or hardware include the following:

We will be discussing the Packet Filtering firewall in detail in this blog.

What is Packet Filtering Firewall?

What is Packet Filtering Firewall?

A packet filtering firewall is a network security feature that regulates the flow of incoming and outgoing network data. Each packet containing user data and control information is examined and tested by the firewall using a set of pre-defined rules. If the packet passes the test, the firewall allows it to proceed to its destination. Those who fail the test are disqualified. Firewalls inspect packets by looking at rule sets, protocols, ports, and destination addresses.

How does Packet Filtering Firewall work?

Packets are structured data units. Because they divide communications into small bits and transport them independently across the network, these networks are fault-tolerant.

In order to display accurate information, packages are reordered after passing through the firewall and arriving at their destination.

Packet switching, when done correctly, increases network channel capacity and decreases transmission delay and communication efficiency. Packets include two essential components:

Packet filtering firewalls allow or deny network packets based on the following criteria:

Want to become an expert in cyber security and build a successful career, go through Intellipaat’s Cyber Security course.

What Are the Various Types of Packet Filtering Firewalls?

There are four types of packet filtering:

Example of Packet Filtering Firewalls

Packet filters examine each TCP/IP packet, looking at the source and destination IP and port addresses. You can create rules that allow only known and established IP addresses while blocking all unknown or unknown IP addresses.

Denying outsiders access to port 80, for example, would prevent all outside access to the HTTP server, because most HTTP servers run on port 80. You can also configure your firewall to allow only packets intended for your mail or web server while rejecting all others.

Want to become a qualified professional, check out Cyber Security Courses!

Benefits of Packet Filtering Firewalls

Benefits of Packet Filtering Firewalls

There are numerous benefits to using packet filtering firewalls, which include:

One of the prominent advantages of packet filtering firewalls is their efficiency. Routers typically operate at high speeds, accepting and rejecting packets as quickly as possible based on their destinations, source ports, and addresses. As the filter determines the destination and legitimacy of inbound and outbound packets, they are frequently held for only a few milliseconds. The performance overheads of most other firewall techniques are higher than those of packet filtering firewalls.

Career Transition

Another benefit is transparency. While users are aware when a firewall rejects a packet, packet filters typically operate quickly and quietly, obstructing user functionality. Other methods require users to configure firewalls manually for specific clients or servers.

Packet filtering is extremely cost-effective because only one filtering router is required to secure the internal network. Many common hardware and software routing devices include packet filtering. Furthermore, because most website routers now support packet filtering, this is the most cost-effective strategy.

Packet filtering is an appealing option due to its low cost and ease of use. A single screening router can defend an entire network using this security strategy. Because they will not notice packet transfer unless it is rejected, users do not need much information, training, or assistance to use firewalls.

Preparing for job interviews in Cyber Security? Cyber Security interview questions is the place for you!

What are the drawbacks of using a Packet Filtering firewall?

Drawbacks of Packet Filtering firewall

Packet filtering has several advantages, but it also has some disadvantages. Some of the disadvantages of a packet filtering firewall are as follows:


Nobody can deny that the Internet’s rapid rise has brought the world closer together. It has, however, made us vulnerable to a variety of security threats. To protect the confidentiality and integrity of a corporate network’s valuable information from outside attacks, we need a strong mechanism like firewalls.

We hope that this blog helped you resolve your doubts, added a new dimension to your thinking, and guided you to make a better choice. Still, if you have any queries and questions for us, you are most welcome to visit our community page and resolve your doubts. Till then, Happy Learning!

The post What is Packet Filtering Firewall? appeared first on Intellipaat Blog.

Blog: Intellipaat - Blog

Leave a Comment

Get the BPI Web Feed

Using the HTML code below, you can display this Business Process Incubator page content with the current filter and sorting inside your web site for FREE.

Copy/Paste this code in your website html code:

<iframe src="" frameborder="0" scrolling="auto" width="100%" height="700">

Customizing your BPI Web Feed

You can click on the Get the BPI Web Feed link on any of our page to create the best possible feed for your site. Here are a few tips to customize your BPI Web Feed.

Customizing the Content Filter
On any page, you can add filter criteria using the MORE FILTERS interface:

Customizing the Content Filter

Customizing the Content Sorting
Clicking on the sorting options will also change the way your BPI Web Feed will be ordered on your site:

Get the BPI Web Feed

Some integration examples