Firewall English name is FireWall, it is to point to be located in the hardware between the computer and network of its place connective or software, also can be located in two or between many networks, for instance the local area network is mixed between Internet, the place know exactly about sth between the network passes firewall according to flowing () seeing a picture. Pass firewall to be able to undertake scanning to the communication between the network, shut insecure port, prevent ab extra DoS attack, block Trojan horse, in order to assure the safety of network and computer.

Firewall divides roughly again for hardware firewall and software firewall: Bulbul of cloth  late wrings the burden that invades Bao of clam of silk ribbon of artisan of bulbul of the late that go to abdicate to call green of  of cloth of take along sth to sb of  of Gui of wine  Juan PU of 貱 of Tuo of Xiang of  of Sao of δ of surname Wu ┕ , make road by stabler. Hardware firewall has WAN, LAN and DMZ3 commonly port, still have all sorts of safe functions, the price is higher, enterprise and large network are used morer. Software firewall is safety defends actually software, for instance firewall of day net firewall, darts of golden hill net, blue aegis is waited a moment.

DMZ:  艱 Emilitarized Zone(keeps apart area or demilitarization area) . This function basically is to solve the problem that after installing firewall, exterior network cannot visit server of local area network, for instance game of conference of FTP server, video, network, DMZ is equivalent to buffer of a network actually, through this area can protect in-house network effectively. Current, the firewall on the market offers DMZ port commonly.

VPN:  芕 Irtual Private Network(is fictitious and special network) . It is to point to be in special with public network (found on Internet) for instance temporarily, safe special network join, call “ channel ” again, not be special really network. In firewall use VPN function can be founded join temporarily, undertake in the network the safety of data is transmitted. Current, major firewall product supports this function.

SPI: Condition of  芐 Tateful Packet Inspection(seals a bag to detect) . Firewall can filter through this function a few abnormal bag, prevent baleful attack, for instance DoS is atttacked.

DoS:  艱 Enial Of Service(rejects to serve) . Through DoS attack can make a server overweighted, cause systematic dead engine, make the computer or network cannot provide regular service. The firewall on the market is had mostly nowadays prevent DoS to atttack a function, what can assure the computer and network so is safe.

IDS:  艻 Ntrusion Detection Systems(inbreaks testing system) . Firewall passes this function to be able to undertake monitoring to the moving state of the network, detect the attack that gives a possibility, in order to assure the safety of the network.
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