Internet Security Firewall: Definition, Types, Functions and Ways of a Firewall

Internet Security Firewall: Definition, Types, Functions and Ways of a Firewall – It is important to understand why we need a firewall and how it helps us in a secure computing world. We need to understand the purpose of information security because it helps us to understand how firewalls can meet those needs.
In the era of high-speed internet access, you connect your computer electronically to a wide network where, unless you have installed a personal firewall, you have limited control and from which you have limited protection. Until recently, unless you worked for an organization that provides high-speed internet access.
What is a firewall? In general, a computer firewall is a software program that prevents unauthorized access to or from a private network. Firewalls are used to enhance the security system of computers connected to networks, such as LAN or the Internet. They are an integral part of a comprehensive security framework for your network.
A firewall completely isolates your computer from the Internet using a “code wall” that checks each data “packet” when it arrives on both sides of the firewall, in or out of your computer to determine whether it should be allowed to pass or be blocked.

Firewalls have the ability to further enhance security by activating granular control over the types of functions and processes of systems that have access to network resources. This firewall can use various types of signatures and host conditions to allow or deny traffic. Even though it sounds complicated, a firewall is relatively easy to install, install, and operate.

Most people think that a firewall is a device that is installed on a network, and controls the traffic that passes through a network segment.
However, you can have a host-based firewall. Can be operated on the system itself, for example with ICF (Internet Connection Firewall). Basically, the work of the two firewalls is the same: to stop intrusion and provide a powerful access control policy method. In a simple definition, a firewall is nothing but a system that protects your computer; access control policy enforcement points.
Firewalls can be either software or hardware, although preferably both. A software firewall is a program that is installed on each computer and manages traffic through port numbers and applications, while a physical firewall is equipment that is installed between your network and gateway.
Packet-filtering firewalls, the most common type of firewall, check packets and forbid them to pass through them if they do not match established security rules. This type of firewall checks the source and destination IP addresses of packets. If the packet matches the “permitted” rules on the firewall, it is trusted to enter the network.
Packet-filtering firewalls are divided into two categories: stateful and stateless. Stateless firewalls check packets independently of each other and have no context, making it an easy target for hackers. Conversely, stateful firewalls remember information about packets that were passed before and were considered to be far more secure.
Although packet-filtering firewalls can be effective, they ultimately provide very basic protection and can be very limited, for example, they cannot determine whether the contents of requests sent will affect the applications that they reach. If a malicious request that is permitted from a trusted source address will result in, say, database deletion, the firewall will have no way to find out. Next-generation firewalls and proxy firewalls are better equipped to detect these threats. Here’s how a firewall works by type:
It combines traditional firewall technology with additional functionality, such as encrypted traffic inspection, intrusion prevention systems, anti-virus, and more. Especially, that includes inspection of packages in (DPI). While the basic firewall only sees packet headers, deep packet inspection checks the data inside the packet itself, allowing users to more effectively identify, group, or stop packets with dangerous data.
A proxy firewall is a firewall that filters network traffic at the application level. Unlike a basic firewall, a proxy acts as an intermediary between two end systems. The client must send a request to the firewall, which is then evaluated against a set of security rules and then allowed or blocked. Most specifically, proxy firewalls monitor traffic for layer 7 protocols such as HTTP and FTP, and use stateful and deep packet inspection to detect malicious traffic
Firewall Network Address Translation (NAT) is what allows multiple devices with independent network addresses to connect to the internet using one IP address, thus hiding each IP address. As a result, attackers scan the network for IP addresses unable to capture specific details, providing greater security against attacks. The NAT firewall is similar to a proxy firewall because a firewall acts as an intermediary between a group of computers and outside traffic.
This type of firewall filters packets at the network, transport and application layers, comparing them with known trusted packages. Like the NGFW firewall, SMLI also checks all packets and only lets them pass if they pass each layer separately. This firewall checks the packet to determine the state of communication (hence the name) to ensure all communication that starts only takes place with trusted sources.
The firewall carefully analyzes incoming traffic based on predetermined rules and filters traffic originating from insecure or suspicious sources to prevent attacks. A firewall protects traffic at the computer’s entry point, called a port, which is a place for exchanging information with external devices. For example a source address gets permission to reach destination through port 22.
Think of the IP address as the house, and the port number as the room in the house. Only trusted people (source addresses) can enter the house (destination address) at all – then filtered further so that people in the house are only allowed to access certain rooms (destination port), depending on whether they are the owners. , a child or a guest. Owners are allowed to go to any room (any port), while children and guests are allowed to enter certain rooms (certain ports).
Like anything, high-speed connections have their own weaknesses. Ironically, features that make high-speed connections attractive are also reasons that make them vulnerable. On the one hand, connecting to the internet through a high-speed connection is like leaving your front door open and unlocked. This is because a high-speed internet connection has the following features:
  • Constant IP – Makes it easy for intruders who find your computer on the internet to find you again and again.
  • High Speed Access – Means an intruder can work faster when trying to get into your computer.
  • Connection is always active – meaning your computer is vulnerable every time you connect to the internet.

Dependent on Personal Firewall
So now you have an idea of how vulnerable you are each time when you are online on a high-speed Internet connection, compared to a regular 56Kbps connection. What you now need to know is how you can defend yourself against the threats posed by this type of connection
Personal Firewall Important When
  • You surf the internet at home using a ‘always active’ broadband connection
  • You are connected to the internet through public WiFi networks in parks, cafes, or airports
  • You run a home network that must remain isolated from the internet
  • You want to be kept informed when there are programs on your computer that are trying to connect to the internet
  • Most Personal Firewalls are very configurable so you can easily create a security policy that suits your personal needs

A firewall is software that is used to maintain the security of a private network. Firewalls block unauthorized access to or from private networks and are often used to prevent unauthorized Web users or prohibited software from getting access to private networks that are connected to the Internet. A firewall can be implemented using hardware, software, or a combination of both.
Firewalls are recognized as the first line of defense in securing sensitive information. For better security, data can be encrypted.