disable_mDNS.md

• macOS Ventura (13.4, M1) 環境で確認済み。

Disable mDNS on macOS

1. sudo defaults write /Library/Preferences/com.apple.mDNSResponder.plist NoMulticastAdvertisements -bool YES
2. Reboot

Enable mDNS on macOS

1. sudo defaults write /Library/Preferences/com.apple.mDNSResponder.plist NoMulticastAdvertisements -bool NO
2. Reboot

1. Disabling SIP is not required, as far as I know
2. If the file does not exist, running sudo defaults write ... command is enough. The command will automatically create the file (file format is binary-encoded plist) that look like this:

reishoku@sequoia ~> file /Library/Preferences/com.apple.mDNSResponder.plist
/Library/Preferences/com.apple.mDNSResponder.plist: Apple binary property list
reishoku@sequoia ~> plutil -p /Library/Preferences/com.apple.mDNSResponder.plist
{
  "NoMulticastAdvertisements" => 1
}

For more detailed information, refer to the manpages (man 8 mDNSResponder) that comes with your macOS installation.

Great! Thank you very much!

Newer versions of macOS use mDNS heavily (for Handoff, etc...), so please note that there are some caveats. I think macOS will run fine without mDNS, though.

Good to know! Thanks!