Is there any Apple software or app that can disable internet in a lab?

I manage a computer lab of 28 computers and just need SOMETHING that can remotely disable the internet temporarily. I am going out of my mind trying to find something that will work. Its a wireless lab, used by HS students. I have no control over the wireless hub/ "airport"/ whatev settings,  parental controls are not a viable option. ARD seems to have been a bust.
Suggestions?

The easiest thing to do is use ARD to set the proxies to a non-existant proxy server (127.0.0.1)  when you want to disable www.
There is a template in Send UNIX Command>Templates>Network Setup>Web Proxy
Replace the last line of the template with these two and send to clients (test one Mac first):
networksetup -setwebproxy "Wi-Fi" 127.0.0.1 8080 Off
networksetup -setsecurewebproxy "Wi-Fi" 127.0.0.1 8080 Off
Replace "Wi-Fi" with whatever their active Network conenction is named in System Prefs>Network, as sometimes it has a custom name if Wi-Fi has been retrofitted.
To turn internet ON, repeat the above with commands to disable proxies..
networksetup -setsecurewebproxystate "Wi-Fi" off
networksetup -setwebproxystate "Wi-Fi" off
You can save these Tasks in the sidebar or in the Send UNIX Command>Templates menu and name them "Internet OFF" & "Internet ON".
Then in future, you can just Right-click and choose Run Task.

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