How Does Firewall Security Work and What Is It?

Hamzah Fansyuri

How Does Firewall Security Work and What Is It?
How Does Firewall Security Work and What Is It?

You must first comprehend how a security vulnerability can jeopardize a system’s data and network in order to understand a network security system and its working schematics. Imagine your home lacking a fence or a boundary wall. You would be exposed to various exterior risks, which would allow trespassers and criminals to enter as they saw appropriate. You run the risk of having all or nearly all of your possessions stolen.

Read also: How does cloud server computing define an instance?

Imagine your computer lacking any security measures, such as a built-in firewall security system; this would enhance the likelihood that hackers would infiltrate your network or that an unauthorized administrator would gain access to your data. 

To get around this, a virtual wall can prevent our personal information from falling into the wrong hands, much like boundary walls protect our homes. This barrier is referred to as a firewall in networking. Firewalls have protected consumers from online hackers and unwanted access for a very long time. Evidently, servers and network systems all over the world exhibit this.

We must go over the different kinds of firewalls and their advantages before we can delve deeper into this subject. Security for hosting, network-based firewalls, security solutions, and other topics will be covered. Go on reading.

How do firewalls work? 

A firewall is a system that filters data resources and information from the internet in order to stop unauthorized administrators or hackers from accessing a private network. A firewall functions as a regulatory system by blocking undesired traffic and allowing desired traffic.

A complete network firewall builds a barrier of safety, shielding a private network from the flaws of the public internet. Hackers and malicious code traffic frequently test the virtual firewall to gain access to the data kept on your web.

What Functions of a Firewall? 

The firewall acts as a gatekeeper at the entrance to your server or computer, allowing only incoming traffic that has been set up to accept it. Your network’s network traffic is filtered by firewalls, which analyze it to determine whether traffic should be permitted or limited depending on a set of rules put up to detect cyberattacks. 

Network packets, which contain information such as the source address, destination address, and other parameters, are how your computer connects with the internet. The firewall applies a set of rules depending on the specifics of these three network packets when they enter your computer through ports. 

Only reliable IP addresses or sources are permitted access to your network through the firewall. For instance, the firewall will automatically reject IP addresses like unless special permissions are set up to allow entrance.

The firewall steps in to save the day when you connect your computer to the internet because you leave yourself vulnerable to hackers and intruders trying to access your computer using your PC’s IP address. The firewall separates your laptop and the internet. In contrast to allowing data packets from reliable source addresses, the firewall rejects malicious data packets.

Collective Firewalls

Hardware and software firewalls can both be classified as one type. By grouping firewalls, you may better understand them and determine the kind of firewall you require for network protection. 

Computer Firewalls

Host-based firewalls, also known as software firewalls or virtual firewalls, are applications that are placed on a server. 

Firewalls in hardware

Hardware firewalls are pieces of machinery or apparatus installed between your internal network proxy service firewall and the perimeter firewall of the gateway. An excellent example of a hardware firewall is Fortinet routers.

Firewall Types

Network security is complete with firewalls, which guard against malicious activity and illegal access to computer systems and networks. There are numerous firewall varieties, each with unique features and capabilities. Here are five types of firewalls that are frequently used:

Firewall with packet filtering:

At the network layer (Layer 3) of the OSI model, packet filtering network firewalls function. Based on predefined criteria and filters, such as source and destination IP addresses, ports, and protocols, they look at each data packet. If a package satisfies the stated criteria established with a packet filter, it is either granted or refused access to a network through the firewall. Generally speaking, packet-filtering firewalls are quick and effective, but they need more sophisticated inspection capabilities.


  • Because it operates at the network layer, it is quick and effective.
  • Offers vital defense against illegal access.
  • Straightforward configuration and minimal maintenance needs.


  • Because it lacks sophisticated inspection capabilities, it is susceptible to some forms of attacks.
  • Limited capacity for application-specific traffic analysis.
  • Attackers can get around it by employing strategies like IP spoofing.

Firewall with Stateful Inspection:

Official inspection Firewalls, also referred to as dynamic packet filtering firewalls combine stateful inspection, which provides connection awareness with packet filtering characteristics. They monitor the status of network connections and decide whether to permit or reject packets based on the overall context of the conversation. By allowing only valid or harmful traffic into the network, this strategy enhances security.


  • Provides enhanced security by taking network connections’ context into account.
  • Depending on the connection state, it can dynamically permit or reject traffic.
  • Offers improved defense against specific assaults, such as IP spoofing.


  • Due to the need to preserve connection status information, latency could be introduced.
  • Limited capacity for application-layer content inspection.
  • They may need help managing sophisticated or large-scale network infrastructures.

Proxy and Application Layer Firewalls

Application layer firewalls, also known as proxy service firewalls, function at the OSI model’s Layer 7 application layer. They function as a middleman between the client and the server, looking at application layer data and making security judgments based on the content, like HTTP headers or payload. Due to the proxying procedure, the application layer or proxy firewall may incur extra latency but offer extensive inspection and granular control.


  • Enables fine-grained control and in-depth analysis of application-layer traffic.
  • CanCan recognize and obstruct particular application-level threats.
  • provides robust defense against a variety of attacks, including those that exploit application-specific flaws.


  • Introduces additional latency as a result of proxying and thorough application data analysis.
  • Needs specialized setup and support for each application or protocol.
  • They might need to work correctly with specific apps or protocols.

NGFW: Next-Generation Firewall

Traditional firewall functions are combined with extra security features, including intrusion prevention systems (IPS), deep packet inspection (DPI), and application awareness in next-generation firewalls. By enabling administrators to apply more sophisticated security rules and policies based on application type, user identification, and content, NGFWs improve visibility into and control over network traffic. They frequently have capabilities, including VPN support, complete antivirus defense, and web filtering.


  • Combines established firewall capabilities with cutting-edge security measures.
  • offers application awareness and deep packet inspection for improved threat detection.
  • Enables precise network traffic control based on the application, user, and content.


  • It might need powerful hardware and be resource-intensive.
  • Complexity in management and configuration due to a large number of features.
  • When additional security features are enabled, performance is affected.

Firewall with Unified Threat Management (UTM):

Firewalls with unified threat management combine several security measures into a single unit. UTM firewalls often integrate antivirus, anti-spam, web filtering, intrusion detection and prevention, support for virtual private networks (VPNs), and other security features in addition to standard firewall capabilities. UTM firewalls provide a complete security solution by combining many security tasks into a single appliance, simplifying the management of network security devices.


  • Provides thorough protection by combining various security elements into a single device.
  • It decreases the cost of hardware and maintenance and simplifies network management.
  • provides a comprehensive security strategy that includes antivirus, web filtering, and intrusion detection.


  • For more extensive networks, its performance and scalability might be constrained.
  • It depends on just one thing, which could lead to a single point of failure.
  • It has to be updated and maintained frequently to keep all security features current.

In what ways do firewalls aid in network security?

Firewalls evaluate network traffic in order to decide whether it should be allowed or denied depending on predefined rules. This process is known as access control. By filtering incoming and outgoing traffic, firewalls prevent unauthorized network access and restrict the flow of potentially hazardous content.

Threat Reduction: Firewalls help keep a variety of dangers and attacks from entering the network. They can reduce the risk of compromise and infection by blocking dangerous traffic, including known malware, viruses, worms, and suspicious network packets.

Firewalls, which partition multiple network regions into distinct security zones, promote network segmentation. Inhibiting the lateral flow of threats within the network lessens the impact of a security breach.

Monitoring of Network Traffic: Firewalls can keep track of network activity, providing administrators with information on connections and data flowing into and out of the network. By assisting in the detection of odd or suspicious activity, this monitoring enables quick response and mitigation.

Application layer inspection and control are features that sure firewalls offer, enabling administrators to create rules based on specific programs or protocols. This reduces the attack surface and reduces risks by allowing the implementation of security measures tailored to the requirements of particular applications.

VPN Support: Virtual Private Network (VPN) support is a feature that many firewalls provide, enabling safe remote network access. Firewalls can authenticate and encrypt VPN connections, guaranteeing safe communication between remote users and the internal network.

Logging and auditing: As part of this process, firewalls are typically required to have logging and auditing capabilities that record network traffic, rule matches, and security events. These logs are helpful for forensic analysis, compliance, troubleshooting, and monitoring network events.


Your systems are now protected against outside, unauthorized administrators trying to access them by using a firewall. A cloud hosting firm called ServerMania provides dedicated server hosting, as well as hosting security with built-in firewalls to guard you against hackers. We offer distinctive servers that are well-suited to satisfy your needs.

Book a free consultation with us to discover more about server cloud backup, which can help you store and safeguard your data from unauthorized administrators. We may configure a firewall precisely for your needs by taking into account your needs.



Hamzah Fansyuri

I like reading and learning new things, especially about Blogging and Education and then applying them in my work

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