firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and untrusted external network, such as the Internet.

Firewalls are often categorized as either network firewalls or host-based firewalls. Network firewalls filter traffic between two or more networks and run on network hardware. Host-based firewalls run on host computers and control network traffic in and out of those machines.

Basic Recommendation: Home and Business

  1. Make sure your business Network, Business Computers, Home Computers has a firewall.
  2. Make sure it is turned ON
  3. Keep log files from the firewall


Types of Firewalls and features

  1. Operating System Based (IE: Windows, Mac OS X, Linux, Unix)
  2. Commercial/opensource/Free Firewalls for Operating Systems
  3. Routers, sold with built in Firewalls
  4. Dedicated Hardware based Firewalls
  5. Software Dedicated Virtual Firewalls