When a computer is connected to the Internet (or any other network), it is a potential target for attacks. Numerous data packets are randomly sent by hackers to spot connected machines. The latter are looking for a security hole to exploit it and access its data.
As a result, it is necessary, particularly for internet users with an internet connection (particularly cable or ADSL), to protect your computer from network intrusions by installing a firewall system. A firewall is a system that lets you protect a computer from network intrusions (or protect a local area network from Internet attacks).
In addition, a firewall lets you control network access for the applications installed on the machine. Trojan horses are a kind of virus that open a flaw in the system to give a hacker remote control of the machine. A firewall lets you spot suspicious connections on the machine, but it also lets you prevent them.
ZoneAlarm is a personal firewall (a software program for private individuals) that makes it possible to protect a networked machine. Its extremely simple installation and configuration as well as its high protection level make it a reference solution for personal computer protection.
This firewall lets you:
Installing the software is extremely simple: you firstly need to acquire the latest version of ZoneAlarm:
Once ZoneAlarm is installed, simply execute it (it is activated by default at startup).
Whenever you use an application for the first time that tries to connect to the network (Internet browser, messaging client, FTP client, etc.) ZoneAlarm will present you with a warning asking to you authorize or reject the application's access to the Internet.
You are therefore reassured that no information can leave your system without your authorization. The box you can check at the bottom of the page (Remember the answer each time I use this program) lets you respond only once for each application.
The Programs tab lets you define each application's parameters:
The Security tab lets you define protection levels (called Zones). ZoneAlarm defines two zones:
Defining the machines you allow to access your shared directories and printers is easy. Simply click the Advanced button in the Security tab.
By clicking the Add button, you can add the following items:
Here is an example showing how to add the group of IP addresses ranging from 10.16.1.1 to 10.16.255.255.