tailieunhanh - Windows Firewall and Windows XP

The ICF, now dubbed Windows Firewall, is a simple stateful firewall that is part of the Windows XP operating system. In essence | Windows Firewall and Windows XP The ICF now dubbed Windows Firewall is a simple stateful firewall that is part of the Windows XP operating system. In essence Windows firewall provides the same core functionality that other personal firewall products on the market provide such as stateful connection management and configurability for specific traffic that is desired. Windows Firewall does come bundled with every new version of Microsoft s operating systems. The firewall capabilities can also be utilized in Windows Server 2003 Standard and Enterprise editions. Essentially Windows Firewall is the next version of Microsoft Windows ICF. It provides basic filtering capabilities on all Windows XP and 2003 Server platforms so that an administrator or end user can limit the traffic reaching the system it does not filter traffic coming from the system . It s limited in that it is not a stateful firewall but rather a simple access list type of filter. Also it only looks at the network and transport layers of the ISO protocol stack Layers 3 and 4 . This firewall is mostly useful for end users who do not require complex firewall capabilities to protect their systems and are looking for a simple packet filter to block typical Windows services such as NetBIOS Remote Procedure Call RPC and others. How Windows Firewall Works By default Windows Firewall comes with an assigned security profile. This profile provides what are termed as exceptions for Print and File Sharing as well as Remote Assistance and Universal Plug-and-Play UPnP with the local subnet. The local subnet is defined as the local network that the system is connected to. If the system is connected to multiple networks for example if the system has multiple interfaces these network ranges are considered part of the local subnet. These services allow the ports listed in Table 4-1 to connect to the system. Table 4-1. Default Windows Firewall Profile Exceptions Service TCP Ports UDP Ports Program File and Printer Sharing .