Firewall - Kaspersky Lab

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Kaspersky Internet Security 2012 Table of Contents Firewall ......................................................................................................................................... 2 What is Firewall ......................................................................................................................... 2 Enabling/disabling Firewall ........................................................................................................ 2 Changing the network status ..................................................................................................... 3 Firewall rules ............................................................................................................................. 4 Configuring notifications of changes in the network ................................................................ 23 Advanced Firewall settings ...................................................................................................... 24 Firewall working features ......................................................................................................... 26 1 | 26
Kaspersky Internet Security 2012 Firewall What is Firewall Today computers have become quite vulnerable when on the Internet. They are subjected not only to virus infections but other types of attacks as well that take advantage of vulnerabilities in operating systems and software. KIS 2012 contains a special component, Firewall in Protection Center, to ensure your security on local networks and the Internet. Firewall applies rules to all network connections. A Firewall rule is either an allowing or blocking action performed by Firewall once it detects a connection attempt. Protection against various types of attacks is performed on two levels: network and application. Protection on the network level is performed by using global packet filtration rules where network activity is allowed or blocked based on analyzing settings such as: ► packet direction; ► the data packet transfer protocol; ► the outbound packet port. A network package is a block of information transferred in the network. As a rule the package consists of the header (package information, such as the creation date, size, recipient and etc), the body (the transferred information itself) and the ending (checking information which guarantees that the package was not changed during the transfer). Protection on the application level is applying application rules for using network resources to the applications installed on your computer. Like the network protection level, the application protection level is built on analyzing data packets for direction, transfer protocol, and what ports they use. However, on the application level, both data packet traits and the specific application that sends and receives the packet are taken into account. Using application rules helps you to configure more specific protection when, for example, a certain connection type is banned for some applications but not for others. Enabling/disabling Firewall By default, Firewall is enabled. You can disable Firewall if needed. To enable or disable Firewall, perform the following actions: 1. Open the main application window. 2. In the top right corner click the Settings button. 3. In the left part of the window in the Protection Center section select the Firewall component. 4. In the right part of the window perform the following: ► Uncheck the Enable Firewall box, if you need to disable the component. ► Check the Enable Firewall box, if you need to enable the component. 2 | 26
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