This section explains the basic principle of Windows personal firewalls. It is not necessary to set up the firewall in the same way in order for it to be safe. A typical personal firewall is made up of three or four components.Get more informations read on the website
Driver for the kernel
The kernel driver is the first component. It serves two primary purposes, which is why it is often introduced in two parts rather than one. A packet filter is the first feature. This driver usually tests any packet that comes in from the network or goes out to the network on the NDIS, TDI, or both levels. Inbound and outbound link security is another name for this. There are some personal firewalls that don’t provide inbound or outbound link security. However, because of their secondary purpose, these items often provide kernel drivers. The sandbox role is the second. SSDT hooks and SSDT GDI hooks are the most popular sandbox implementation methods. The firewall driver replaces certain device functions with its own code that checks the calling application’s rights and either rejects or transfers the action to the original code. These methods enable the firewall to monitor and regulate all potentially dangerous application behaviour, such as attempts to open files, processes, registry keys, change firewall settings, and automatically respond to its queries, among other things.
Support to the system
Machine services are specialised user mode operations. In the method, these processes have unique functions and behaviours. They run as a privileged device user rather than as a regular user. Because of this, services will operate independently of the user and even when no one is logged in. In a personal firewall, the function of service is to secure communication between the key components. The service receives messages from both the GUI and the kernel driver and relays them to the appropriate parties. Since there is no corresponding rule for the action in the database, the driver code in the hooked SSDT function may be unable to determine whether to accept or reject the action if the firewall is in learning mode. In this scenario, it wants the consumer to make the decision. This necessitates sending a message to the GUI in order for it to display the dialogue and receive a response. The service part is normally used to carry out this communication. The firewall service is often used to ensure that the user’s GUI is still open.
The user interface is graphical.
The user component of the firewall is the graphical user interface (GUI). It often employs a trayicon from which the firewall’s administration can be accessed. When the firewall is in learning mode, another essential feature of the GUI is to prompt the user for action decisions.