Firewall is part of network security devices. Firewalls can be either a program or hardware that is specially designed to filter information between the public network (internet) and private networks. If a package was bound by the rule firewalling, packet is not allowed to be transmitted or received. There are many reasons for the firewall to be important in network environments. At least the firewall has three roles namely
Controlling . When we design a server to connect the internal network with other free networks. As the Internet A has an idea to filter incoming traffic maupn out; allow certain types of traffic and blocking the other type. Example FTP access and close to the network 192.168.10.0 192.168.20.0
Secure . Firewall machine is designed to block attack opportunities (like daniel of services) and unauthorized access from outside. Examples may we close the telnet access from all sources
Prevent . Often the software is damaged or poorly configured machines in local network to spew any packet to the outside world. To anticipate, we menginstrusikan firewall (as a packet filter tool) to provide a variety of things that happened dalamkelurga abnormal tissue.
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