Close and lock the door, then don't give out keys to strangers... Anytime you are connected to the Internet you are assigned an IP address. This is your door, if it is open anyone can come in without you knowing it. the simplest protection is a utility that blocks intruders and alerts you. Most of these can be downloaded free on the internet and offer minimal security. Personal firewall software can be effective, but at times confusing to set up and a separate copy is required for each machine. The most effective firewall is a hardware device. It can be a separate computer with two network cards installed and proxy software. The important thing is having two network cards or MAC addresses, forcing network traffic through the proxy software. Another solution is a stand alone firewall device between your computer, or network and the Internet.

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