With the popularity and rapid development of Internet applications, network security has become a problem that people are worried about. Viruses and hackers are the main hidden dangers of network security, and they are constantly threatening. The security of computer systems for Internet applications. As the main means to prevent hackers, network firewalls have become a must-have device for network security construction. Do you know about it? Especially the firewall under the new system win7, how much do you know? Even if you don't understand, It doesn't matter, today you can learn this section with Xiaobian.
The history of Windows Firewall
The firewall software in Windows XP only provides simple and basic functions, and can only protect inbound traffic, blocking any Inbound connections that are not natively started, by default, the firewall is turned off. The SP2 system is enabled by default, allowing system administrators to enable firewall software through Group Policy. Vista's firewall is built on the new Windows Filtering Platform (WFP), which adds the ability to filter outbound traffic through the Advanced Security MMC snap-in. In Windows 7, Microsoft has further tuned the firewall's capabilities to make the firewall more user-friendly, especially on mobile computers, and capable of supporting multiple firewall policies.
Windows 7 Firewall
In Vista, the basic settings of the Windows 7 firewall are set through the control panel program. Unlike Vista, you can also access advanced settings through the control panel (including configuring outbound connection filtering). Instead of creating an empty MMC and adding a snap-in. Just click on the advanced settings link in the left panel.
More Network Options
Vista Firewall allows users to choose public or private networks. In Windows 7, you have three choices: public, home or work, both of which are considered private networks. .
If you choose the "Home Network" option, you can create a Homegroup. In this case, network discovery is automatically turned on so that you can see other computers and devices on the network and they can see your computer. Computers belonging to Homegroup can share pictures, music, videos, and document libraries, as well as share hardware devices such as printers. If you have files in your folder that you don't want to share, you can also exclude them.
If you choose "Work Network", the network discovery is enabled by default, but you will not be able to create or join Homegroup if you add your computer to the Windows domain (via Control Panel System Advanced System Settings Computer Name tab) And through the verification of the domain controller, the firewall will automatically regard the network as a domain network.
When you connect to a public wireless network or use a mobile broadband network at airports, hotels or cafes, you should choose "public network", network discovery will be turned off by default, so other computers on the network will Can't see your computer, you can't play Sichuan opera or belong to Homegroup.
For all network types, by default, Windows 7 Firewall blocks connections to programs that are not on the allowed program list. Windows 7 allows you to configure settings for each type of network.
Multiple Active Modes
In Vista, even if you have configured profiles for public and private networks, only one is valid at a given time. If your computer is connected to two different networks at the same time, then things are not good, then all the connections will be used in the strictest mode, which means you may not be able to do all the required operations on the local network because The rules for the public network mode are used at this time. In Windows 7 (and Server 2008 R2), you can use different modes for each network adapter at the same time, using private network rules for private network connections, and public network rules for traffic from public networks.