Check what's recreating it: Run this to see if Internet Sharing is active: bash sudo defaults read /Library/Preferences/SystemConfiguration/com.apple.nat If you see SharingDevices with entries, Internet Sharing has been configured. Disable it in System Settings → General → Sharing → Internet Sharing and make sure it's off. If you use Parallels or VMware, check that your VMs aren't set to Bridged networking mode — that's what creates the bridge at boot.