Windows Firewall Firewalls restrict network traffic based on a collection of configurable rules. Another name for these rules is exceptions. When traffic reaches a network interface protected by a firewall, the firewall analyzes it, either discarding the traffic or allowing it to pass on the basis of the rules that have been applied to the firewall. Windows 7 uses two firewalls that work together: Windows Firewall and the Windows Firewall with Advanced Security (WFAS). The primary difference between these firewalls relates to the complexity of the rules that can be configured for them. Windows Firewall uses simple rules that directly relate to a program or service. WFAS allows for more complicated rules that filter traffic on the basis of port, protocol, address, and authentication. .When thinking about how firewall rules work, remember that unless a rule exists that explicitly allows a particular form of traffic, the firewall will drop that traffic. In general, you must explicitly allow traffic to pass across a firewall, though there will be some occasions when you need to configure a deny rule. . Windows Firewall and WFAS ship a minimum number of default rules that allow you to interact with networks. This means that although you are able to browse the Web without having to configure a firewall rule, if you try to use an application to interact with the network that is not covered by a default rule, such as File Transfer Protocol (FTP), you receive a warning. This behavior is different to earlier versions of Microsoft Windows, such as Windows XP, where the firewall blocked only incoming traffic and did not block outgoing traffic. The firewall in Windows 7 blocks most outbound traffic by default. When a program is blocked for the first time, you are notified by the firewall, allowing you to configure an exception that allows traffic of this type in the future.extension. Exported policies use a binary format, not Extensible Markup Language (XML) format like many other Windows 7 configuration files. You can also export and import firewall policies in the same .wfw format using the netsh advfirewall export or netsh advfirewall import commands. Cyberlove
Posted on: Sat, 23 Nov 2013 08:06:43 +0000
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