Do not forget that installing anti-virus does not solve all problems at once, because if your LAN has Internet access, you should be ready for hacking attacks and the fight against worms. If you believe that your network does not can anyone be interested in, then you are mistaken. Even if there's no sensitive information (lists of usernames / passwords for different resources, credit card numbers, bank account numbers), hackers can hack it out just like that, out of interest. Such unauthorized actions are becoming popular, so is high enough probability of attack is on your network. It is for this reason, you should promptly take care of security and establish firewall. Firewall (firewall, Eng. "Firewalls") – a program or a special device that passes through itself all the traffic. This program is part of a network, and leaves it to filter traffic.
In the process of analysis and filtering data streams firewall is based on specially installed by the system administrator rules, blocking data packets or skipping them. With this program (or device) may not only to protect the LAN from external attack, but also to manage it. For example, you can restrict access to network resources, to block the work of popular IRC clients or ICQ, prevent the banners from Web pages. If your network is small, then the acquisition of network equipment such as a hardware firewall is unlikely to be justified, so you should stay on the program implementation of this device. At the moment There are a variety of software firewalls, which are different set of features, ease of use and, of course, cost. One of the best firewall is Kaspersky Anti-Hacker, which is engaged in developing Kaspersky Lab. Program Kaspersky Anti-Hacker is designed to protect your computer from unauthorized access and hacker attacks from the Internet or LAN. Licensed copy of Kaspersky Anti-Hacker is worth about $ 50, but the developers offer various discounts. Members of this program are eligible for support around the clock by phone and email. Taking into account its low price, then Kaspersky Anti-Hacker is ideal for protecting small local networks.