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firewall Guide

The term „firewall“ comes from the English language and means „firewall“ or „firewall“. It is a backup system that protects computers or computer networks from unwanted access. Originally, the term comes from firewall from the construction industry. Because firewalls should prevent the spread of fires. firewall programs work according to this principle, which are intended to prevent malware intrusions when communicating and exchanging data over the Internet. Protects against infection with contaminant software firewall though not.

The functionalities of a firewall

To protect computers or networks from digital, unwanted attacks, firewalls are used. At a firewall It is a software that allows an administrator to restrict network access. The sender and the services used are taken into account as the basis for an administrator’s settings. The firewall software monitors the ongoing traffic and decides which network packets are left by the system and which are blocked. As a result, unauthorized network access can be prevented. However, firewall software does not detect attacks. The rules for blocking attacks must therefore be specified separately. However, there are firewall products that have so-called IDS modules that are responsible for detecting attacks. Such modules can also be set up with existing firewall programs.

What happens if none firewall is active

When a computer or network is connected to the Internet, many „doors“ are opened. These doors allow potential attackers access to the PCor to a network over the Internet. They are also called ports in technical jargon. Computers can use computers to communicate with each other, such as when exchanging emails or watching web pages. In principle, when such a port is open, anyone can use it to send or receive data over the Internet. If ports are not sufficiently protected, attackers can trigger different functions on the PC, such as the microphoneor one printeractivate or steal or delete private data. Often the PC user does not get this intervention in the system at all or only very late.

How the firewall fends off attacks

The more ports are open, the easier it is for an intruder to gain access to the system. Therefore, all ports that are not needed should be turned off. A firewall performs this task for the user and also protects open ports against unauthorized access. It is important, however, that after installing a firewall the correct settings are made. These settings specify rules that indicate which computers are allowed to communicate with and in which language. Modern firewalls help with these settings and ask if a foreign computer tries to communicate with the device being protected. So that the user does not have to respond to this constant demand every time, modern firewalls are equipped with a reminder function, with the help of which the firewall software remembers previous communication confirmations. Next time, the firewall will not ask the user if communication is allowed or not. Despite good firewall software, every computer or network has specific vulnerabilities that attackers can take advantage of. These may be, for example, unblocked communication channels, such as the settings for e-mails and Internet downloads. These channels allow an attacker to gain access to the system and install malicious software. In the worst case, this software can take control of the device. In order to detect such malware, every PC user should install an anti-virus program in addition to the firewall.

Differences in the firewalls

Basically, a distinction is made between a personal firewall and an external firewall. The personal firewall protects individual devices, while an external firewall protects entire networks from unwanted access and is used in companies or households with multiple PCs. External firewalls do not work on the protected system itself, as is the case with personal firewalls, but are installed on a separate device. This device connects the devices together and uses the firewall software to protect all systems connected through the device. Most operating systems have already integrated a firewall. However, there are strong differences in function and quality among these. For this reason, many manufacturers offer improved firewall solutions that you can additionally install as a user. These differ in the usability, functionality and requirements that the user places on the computer.

*Last update on 2018-12-06 / Affiliate links(we get a commission when you buy on amazon) / Images from Amazon Product Advertising API