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In your local network setup all services heavily rely on a properly working Bonjour service (dns-sd), because you have no local domain name service. To detect propagated dns-sd services of a host use the following command (please replace "ip-address" below by the ip-address of your Mac named user-mbp; use ifconfig -a on that Mac to get it): dig ...


Append .local to your machine name. If that works, and you don't want to have to do that, in System Preferences > (interface) > Advanced > Search Domains, add ".local".


EDIT: I missed that you want a linux based machine as your source. The following is Mac to Mac using Applescript: tell application "Finder" of machine "eppc://UserName:Password@Computer.local" display notification "This is the message body." with title "Message Title" with subtitle "Message Subtitle" end tell Applescript. No need for Growl. ...


There are a number of ways to do this, depending on your network setup. You could as @tron_jones suggested use isolated networks or VLANs. Another way would be to setup the router so that each class room is on a different subnet i.e. for class room 1 for class room 2 for class room 3 mDNS / Bonjour does not broadcast ...

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