For those of you who are used to connect to the internet, may have often heard the term firewall or often translated into Indonesian to "Wall of Fire." Did you sense that firewall?
A firewall is a system or device that allows network traffic that is considered safe to pass through and prevent network traffic that is not safe. In general, a firewall is implemented in a dedicated machine, running on the gateway (gateway) between local networks and network lainnya.Selain, it is also used to control access to anyone who has access to a private network from outside parties.
Firewall is divided into two types, namely:
1. Personal Firewall: Personal firewall designed to protect a computer connected to the network from unwanted access. Firewalls of this type lately turned into a collection of programs that aim to secure the computer in total, with the addition of some additional security features - a kind of protection devices against viruses, anti-spyware, anti-spam, and other. Today there are some other firewall product comes with a network security breach detection function (Intrusion Detection System), for example: Microsoft Windows Firewall (which have been integrated in the operating system Windows XP Service Pack 2, Windows Vista and Windows Server 2003 Service Pack 1), Symantec Norton Personal Firewall, and others. Personal Firewall is generally only has two main features, namely Firewall and Stateful Packet Filter Firewall.
2. Network Firewall: Network firewall designed to protect the overall network from various attacks. Generally found in two forms, namely a dedicated device or as a software installed in a server. Examples of this firewall is the Microsoft Internet Security and Acceleration Server (ISA Server), Cisco PIX, iptables in the operating system GNU / Linux, and sunscreen of Sun Microsystems, Inc.. which created a package in the Solaris operating system. Network Firewalls in general has some major features, which are owned by other than a personal firewall (stateful packet filter firewall and firewall), Circuit Level Gateway, Application Level Gateway, and also NAT Firewall. Network Firewalls generally are transparent (not visible) from the users and uses routing technology to determine which packages are allowed, and where the packages will be rejected
Hopefully this article can increase our knowledge of all.
source: http://artikel-it.blogspot.com/2009/12/jenis-jenis-firewall.html
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