I’ve written here about all the noise that Apple’s operating system generates. I’m still trying to figure out how to disable this stuff on a laptop where I don’t need all this nonsense – where I work.
One of these noisy features is all traffic on port 5353. I don’t need to automatically connect to things or share my video to my TV and such on my work computers.
Maybe I’ll regret it when I need to print, but I can always turn this option back on if and when I need it, which is rare. Or I could have a separate computer for printing that doesn’t have this feature disabled. I’ll probably opt for the latter.
After searching and searching, I finally figured out how to disable this feature.
I actually found it on the Tenable site which recommends turning off this service if you don’t need it – probably based on some presentations at Defcon or BlackHat if memory serves.
Here is the command to disable this service.
sudo defaults write /Library/Preferences/com.apple.mDNSResponder.plist NoMulticastAdvertisements -bool true
I wrote here how to create a configuration file to run at startup:
I’m not really sure if this is required, but to make sure it stays disabled you can add it to this file.
Well, unfortunately, after this change I still see traffic blocked on port 5353, but at least that’s one less thing to worry about.
Traffic is greatly reduced.