Because the hacker is in flood, therefore to prevent wicked Italy to attack, the firewall software arises at the historic moment. But we should be able to use the firewall software correctly, lets it serve truly for us.
The firewall has defined the security rank, for different need user different safety control, but many users understand these specially, to be safe, blind adjusts the security rank “the high security level”, thought that the security rank is higher is better. Is actually not this. If your computer Pentyl entire, you will discover that the network game was unable to start, moreover the video frequency procedure was also unable to visit on-line video frequency document (this regarding the ADSL user is an enormous loss). What meaning then each kind of security rank is?
Low security level: The computer will open all services, but forbids on Internet's machine visit document, the printer sharing service. Is suitable in provides the service in the local area network the user. This is the degree-of-freedom biggest security rank, therefore is only restricted in “the network master” the use.
Security level: Forbids to visit the system rank the service (for example HTTP, FTP and so on). The local area network internal machine only permits the visit document, the printer sharing service. Uses the dynamic management by rules, the permission authorization movement procedure open port service, for instance the network game or the video frequency pronunciation telephone software provides service. Moreover can guarantee for example the receiving and dispatching mail and the transmission document common user, therefore the general this security rank is a default value.
High security level: The system will shield gets lost the exterior open all ports; Forbids to visit this aircraft to provide all services, carries on the interception to the common wooden horse procedure and the attack; Provides the strict control the network visit ability; Is suitable in is the surfer browsing homepage user merely. Certainly the network played you not to be able to play.
Moreover, all security level can control the application procedure access network the jurisdiction.
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