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DEFINITION: A computer firewall can be either a hardware-based or software-based system designed to deny access to your computer by unauthorized persons or their computers.
When you connect to the Internet, EONI's servers automatically assign your computer connection a special unique but temporary address (IP address) that allows you to communicate with the rest of the Internet. The downside of this scheme is that other computer users with the requisite technical knowledge could theoretically access your computer if they know your IP address. If you have a "broadband" (high-speed, such as DSL) connection to the Internet, or if you have a static IP address, you absolutely should install firewall software, at a minimum. Such a connection tends to be online for greater periods, may be connected even during idle times and is a more tempting target for intruders.
Firewall software can not only detect and block unauthorized attempts from the outside to access your computer, but can alert you when software on your computer tries to communicate with an external site without your knowledge.
EONI, of course, has many layers of rigorous and costly hardware and software firewalls and related mechanisms to protect its customers and its resources. However, end users with less-demanding needs can also equip themselves with firewall protection using relatively low-cost or even "freeware" expedients. Check the firewall section of our SafetyZONE links for some possible candidates. If you have a small-office or home network, you should consider using router hardware (often costing well under $100 for a small network), not only for the convenience of sharing network resources and Internet connections, but for adding some additional security against outside interlopers.
