One of the most basic and important elements of Internet security is to have a firewall in place. A firewall is essentially a barrier that protects a computer from being accessed by other Internet users. In today’s world, one in six people has Internet access, and the technology that allows users in Beijing, New York, Paris, Sydney, and just about everywhere else is amazing. Unfortunately, there are also destructive forces online that seek to enter computers connected to a network in a search for information or to plant software that can do great harm to a computer. As Internet use becomes an even bigger part of life, the use of firewalls to protect systems from unwanted, outside access is more important now than ever before.

A firewall can be either an actual hardware device or software placed on a computer. Its job is to be a filter and only allow information through that meets the standards and requirements set by the user. Incoming data that does not meet the guidelines set forth is not allowed into the system. While this may restrict users from accessing some information, its primary function is to protect users from potentially harmful intrusion into their computer.

There are several types of Internet users that should use firewalls. Individuals with a computer connected to the Internet should have firewall protection, especially those with high speed DSL or cable lines allowing their computer to stay online at all times. Most Internet Service Providers have basic firewalls in place already to keep unfriendly visitors away. Firewalls are also used very often in business. Companies that want to control the types of information that can be accessed or transmitted from their company network can do so by adjusting firewall settings. While employees may complain about the restricted access to information, the company is acting responsibly by controlling the flow of information within their network of computers.

Firewalls work in a few different ways. The most common method is for information that is attempting to be accessed to be divided into “packets” and filtered, looking for keywords, IP addresses, or domain names that are not allowed in the system. Firewalls also look for packets of information that could contain viruses, spyware, or other potentially harmful programs, and blocks suspicious information from gaining access to the network. There are different levels of security that can be set on a firewall, from blocking literally everything to turning the firewall off and letting all information flow freely. Each user needs to determine for themselves an appropriate level of filtering and protection.

There are several types of attacks the firewalls protect against. Some of the more common problems that are avoided include remote login, denial of service attacks, viruses, and spam. The use of a firewall on its own should not be considered a reliable defense against these types of problems, but it’s a great first step. Using reliable anti-virus software and practicing safe computer habits in conjunction with a firewall will help to keep users out of trouble.

Firewalls are a great way to protect your computer from viruses and hackers. There are different levels of security that can be set, depending whether you are on a private network or the Internet. Typically you can allow more access for a small private computer than when you are connected to the Internet.

Firewalls used for Internet connections should be quite strict and allow minimum access. This is not to say that your online experience will be diminished. You simply want to restrict traffic not only leaving your computer but coming in as well. An Internet firewall should also close ports not being used. Luckily, most firewalls are very easy to configure and you can get yours set up with just a few clicks.

For a personal firewall to work there must be two components in use. One component inspects any data that may arrive and determine if it can be allowed through. The other component uses a policy to determine whether or not certain programs may access the Internet.

The first component is known as the packet filter. A packet is essentially data and the firewall determines if the packet is allowed through based on the policy set. If the packet does not meet the firewall policy it is simply dropped and never makes it to your computer. The second component is known as the application filter. The application filter allows programs to send or receive data through designated ports. The standard port number for the Internet is 80, and so most applications using the Internet will use that specific port.

Since other ports can be used by certain modules of some programs, it is still possible that your computer may become infected by a virus. If your anti-virus software doesnít catch one of these infected modules your entire computer is at risk. Because of this you shouldnít rely solely on your firewall for protection. Always have up to date anti-virus software and take care when engaging in file sharing practices on the Internet.

Network firewalls are an important resource for any computer. They work to control and monitor data access from both sides, the Internet and the computer. Computer firewalls take their name from real life firewalls which prevent fires from spreading.

While there are two types of firewall, hardware and software, however some type of software needs to go with the hardware version and of course software needs some type of hardware to reside on.

Hardware firewalls are most typically used between networks. One example of this may be between a corporate network and the Internet. Most administrators set up firewalls so that incoming Internet traffic may be sent to a specific computer or public access area whereas computers within the networks can access the Internet directly. Internal firewalls are also often used which can restrict access for certain user or groups as well as prevent the spread of computer viruses.

Software firewalls are typically used at home on personal computers for secured Internet access. Software firewalls do use computer resources and are typically slower than hardware firewalls. However, for personal Internet use a hardware firewall is quite unnecessary.

Firewalls work by forcing all outgoing and incoming network and Internet traffic to follow a policy. A policy is simply a set of rules which programs and data packets must follow.

Many types of programs require access to the Internet and therefore must be allowed in the firewall’s policy. Internet browsers, email programs, and auto-updating programs such as anti-virus software are just some examples of these types of applications.

More firewalls work by altering you the first time a program tries to access the Internet. If you want to allow access you can configure your firewall as such. Typically if you don’t recognize the program trying to access the Internet disallows it in the policy.

Another important function of the firewall is to close unnecessary ports which are access points from your computer to the Internet. Hackers can find these ports and use them to transfer worms and gain access to your computer. Firewalls can help prevent this from happening. Many firewalls not only close these ports but also render them invisible, making an attack virtually impossible.

The downside to software firewalls is that they are just that, another piece of software which makes them vulnerable to viruses just as any other program installed on your computer. Because of this you should always use common sense when accessing the Internet, never rely solely on your firewall.

[tags]firewall,internet security,privacy,hackers[/tags]