I have my WiFi device sitting in a second floor office with MAC filtering and WEP enabled at the highest encryption level. I live in a residential area and from my second floor vantage point their are 11 active WiFi connections. Considering how far WiFi signal can travel everyone around on this block must have a WiFi device. What is amazing is that 9 of those are wide open. How can people be so ignorant. The statistics are amazing nation wide. Read on. [ZDNet]
Update: Fixed bad link
Why both? If you have MAC Filtering on, MAC’s that are not on the allowed list won’t even be able to log on to the access point.