I am sharing my iMac's ethernet connection as a WiFi hotspot. Who is connected?

I would like to monitor who connects to my iMac's WiFi hotspot. I have protected it with a password, but WEP is easy to crack. Is there a utility for OS 10.7.3/Lion to see who is connected?

arp -a

gives a list of connected interfaces on the same network.

• en1 is Wi-Fi
• en0 is Ethernet (on the Macbook Air this is Wi-Fi)

How to use

Type this command in the Terminal located at /Applications/Utilities/Terminal.app. To learn more about this command, type man arp in the terminal.

You could use a network map like Nmap to 'map out' your connection, and see who is connected. Alternatively, Little Snitch should let you see what they do (ie what they visit).