Along with computer network technology's progressing by leaps and bounds, network security's question already day by day prominently suspended at each kind of user's front. Only the material which grasps from the author indicated that at present will probably have the nearly 20% above users on the Internet to suffer hacker's puzzle. Although the hacker is so rampant, but the network security problem still does not have to be able until now to bring to the enough attention, more users thought that the network security problem was still far to oneself, this point from probably has 40% above users specially is the enterprise user has not installed firewall (Firewall) then to be possible to sneak a peek at a spot, but all questions to everybody proved that a fact, the majority hackers invade the event are because has not been able to install the firewall to initiate correctly.
Firewall's concept and function
Firewall's original meaning originally refers to that wall which ancient times between the people house constructed, this wall might prevent the time which the fire occurred spreads to other house. But here said the firewall is certainly not refers to physical the firewall, but refers to the isolation between the local network and an outside network defense system, is this kind of measure general name. Should say that on the Internet the firewall is one kind of very effective network security model, may isolate the risk region (i.e. Internet or has certain risk network) with the safety zone (local area network) the connection through it, simultaneously will not hinder the people visit to risk region. The firewall may monitor passes in and out the network the communication load, thus completes looked that resembles the impossible duty; Only lets safe, has approved the information enter, simultaneously resists to the enterprise constitutes the threat data. More and more are more common along with the secure question's in fault and the flaw, not only comes from the excellent attack method to the network invasion, also has the possibility to come from disposes on preliminary wrong or the inappropriate password choice. Therefore, firewall's function is prevents not to hope, the authorized correspondence not to pass in and out the network which protects, the force unit is strengthened own network security policy. The common firewall may serve the following purpose: First, may limit other people to enter the internal network, filters the unsafe service and the illegal user; Second, prevents the intruder to approach your defense facilities; Third, definition user visit special stand; Fourth, is monitors Internet to provide the convenience safely. As a result of firewall supposition net boundary and service, therefore suits in the relatively independent network, for example type relative centralism and so on Intranet networks. The firewall is becoming controls visit to the network system very popular method. In fact, in the Internet Web website, surpasses 1/3 Web websites is protects by some form firewall, this is guards against to the hacker strictly, the secure strong one way, any crucial server, after suggests to place the firewall.
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