DNS – Stop and Start DNS services in OS X Yosemite
All versions of Mac OS X from 10.0.0 to 10.9.5 have utilised the open source DNS helper daemon called mDNSResponder. As of OS X 10.10.0 Yosemite, this was removed in favour of Apple’s own in-house DNS helper daemon called discoveryd.
This decision was then reverted back with the introduction of OS X Yosemite 10.10.3 onwards as mDNSResponder was reintroduced.
Commands to restart said services in OS X Yosemite are
Command for discoveryd service:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
Command for mDNSResponder service:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist