After an overview of virus may also not be missing a file on firewalls virus and firewall are still the traditional security combination and both companies and home users massively used. The first document about firewall technology appeared in 1988, before that time were as routers firewall the firewall is designed to incoming and outgoing traffic filtering and / or block.
Although the popular standard operating systems have a firewall, there are plenty of alternatives available it may be an alternative 'personal firewall', or an old computer in firewall is turned below we have an overview of Linux, Mac and Windows firewalls, including several videos and test sites .
Since in 2004 Service Pack 2 for Windows XP, Windows standard was launched on an enabled firewall the Windows Firewall in Windows XP only blocks incoming traffic due to security reasons, Microsoft decided in Vista and later also the firewall to filter outbound traffic.
Mac OS X Firewall
Even Apple's own operating system with a firewall, which some say more than enough is the firewall in Mac OS X however, by default disabled with a few mouse clicks to turn the firewall.
Linux, FreeBSD and Open Source Firewalls
Linux has traditionally been an excellent platform for firewalls over the years there are numerous Linux-based distributions have appeared that an old computer to a brand new firewall can transform.
Who uses a firewall will also know whether this system are well protected on the Internet, various websites to find a scan on the computer to see if all ports are properly screened and / or have other problems.