Firewall Configuration

A firewall is a device or a set of devices, which can be implemented in any of the hardware, software or both. All the messages passing through the firewall are verified to meet some level of security criteria.

It acts as a computer security barrier, which analyzes all the incoming and outgoing traffic to and from your computer or network based on the firewall settings. There are some common types of firewalls like: Application level gateway, Packet filtering firewall, Circuit gateways and Hybrid firewall.

Application level gateway firewall works on the application layer of the protocol stack. It works more intelligently than the packet filtering firewall. Packet filtering firewall examines the information contained in the header of the message packets.

There are some factors based on which the filters can be added or removed from the firewall:

1. IP address

2. Ports

3. Protocols

IP address: Every computer connected to Internet has a unique IP address. The firewall configuration can be customized to block any IP address so that your computer will not allow any kind of communication to take in between.

Ports: The firewall can be configured to allow or block messages from any port number.

Protocols: There are some commonly used protocols like IP, HTTP, TCP, FTP, and SMTP etc., which can be included in the firewall filter.

Some operating systems, such as Microsoft Windows offer built-in firewalls that are turned on by default to block all the incoming threats from Internet. There are several other third party firewalls available. You can choose any one the firewall to replace the default firewall in Windows.

Install Anti-virus

With the increasing pace of Internet usage worldwide, the rate at which the Computer Security systems are being infected is also increasing. Not only the users connected to Internet are infected, but the non-Internet users are also being attacked at the same rate with the use of infected portable storage devices like floppies, CD/DVD, USB flash drives and other for transferring files, data, and other documents among different computer systems.

There has been a tremendous growth in the number of malicious codes developed and spread on Internet. There has been a growth in the virus, spywares, Trojan horse, worms, adware, key loggers and other similar threats. To tackle with this increasing growth of virus and other malicious code on Internet, anti-virus software are simultaneously developed and updated.

In today’s scenario the anti-virus software comes bundled with several additional programs such as firewalls, and spyware removal tools so as to provide a higher level of security to the computer users.

The first line of defense to protect your PC is to install some good anti-virus software carrying the feature of automatic update. The reason behind installing anti-virus software with the automatic update feature is to get the latest protection against the newly released viruses and other malicious codes. The next step is to update the anti-virus with the latest virus definitions.

The install anti-virus software compares the binary code of the content stored on the computer hard disk against the database of virus definitions. When the anti-virus software detects the similar binary code of the virus on the hard disk then it report it as the presence of virus. So, if the virus definition database is updated with the latest virus definitions then your computer system will remain protected against the latest virus attacks.