How do you find who's on your network

I have 6 machines on my AP network for my office & home business. I do not have it password protected. But I have a neighbor who says he can pick up my signal on his laptop. Is there a way to find out who's machine is on your network?

I strongly recommend you password protect your network right away. It doesn't matter who is on your network if even one person is unauthorized. That person could easily get into private data through your network, or simply piggy back onto your Internet connection for a free ride.
If you click on the Network icon in your Finder window, it will tell you the names of all the computers connected together on the local subnet. However, an intruder need not network with the other machines in your system to take advantage of your Internet connection. For example, I have 2 Macs using the Net via my base station. They are not necessarily connected to each other. I can use the Net with both machines at once, but until I actually use Network to connect them together I can't access one machine from another, and I can't see whether or not my other machine is using the Network or not.
On top of that, I have to have Personal File Sharing turned on to share files between 2 machines. You can change these settings in Sharing under System Preferences. That can keep intruders out of your system, but may not tell you who is logged into your subnet unless they Network, or if they have file sharing turned off on their system.
I'm not sure if there is a way to see if you have any freeloaders via an IP address.
Theala

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