前些日子，希望尝试禁止Bonjour广播来减少其在局域网内的影响，于是找了一些方案:

1. 最老的的方案，适合于10.9的是：

launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

2. 到了10.10后，应该使用：

defaults write /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist ProgramArguements -array-add '{-NoMulticastAdvertisements;}'

或者

plistbuddy -c "add :ProgramArguments:1 -NoMulticastAdvertisements" /System/Library/LaunchDaemons/com.apple.mDNSResponderHelper.plist

改动了之后，正好休息两个星期，于是就没有启动，也就快忘记了。到了家之后，忘了什么时候重新启动了一次，发现最近总是觉得上网很慢，打开一个网页要等个几秒钟才能看到内容，App Store也总是不能连接服务器，最初以为是网络服务商的问题或者我的无线路由的问题，检查了一遍没有发现问题。后来发现命令行的softwareupdate也无法连接服务器，Google Chrome浏览器的更新也是出现错误，而且命令行中ping google.com也是无法解析域名了，那么应该是本机自己的问题，再看看系统日志，产生无数的dnssd_clientstub ConnectToServer的错误信息。于是回想起原来禁用Bonjour广播的尝试，那么改回去之后重启，正常多了！

$ sudo plistbuddy -c "print :ProgramArguments:1" /System/Library/LaunchDaemons/com.apple.mDNSResponderHelper.plist
-NoMulticastAdvertisements
$ sudo plistbuddy -c "delete :ProgramArguments:1" /System/Library/LaunchDaemons/com.apple.mDNSResponderHelper.plist

后来在jamf的论坛中找到了一条，Apple的Developer Bug Reporting团队的回复得到10.11下的一些参数，可以整理如下：

Starting in 10.11.x(El Capitan) on OSX, the options will be:
   DebugLogging, UnicastPacketLogging, NoMulticastAdvertisements, StrictUnicastOrdering and AlwaysAppendSearchDomains

To turn ON the particular option, here is what the user should do (as an example of setting two options)
   1] sudo defaults write /Library/Preferences/com.apple.mDNSResponder.plist AlwaysAppendSearchDomains -bool YES
   2] sudo defaults write /Library/Preferences/com.apple.mDNSResponder.plist NoMulticastAdvertisements -bool YES
   3] sudo reboot

To turn OFF all options, here is what the user should do
   1] sudo defaults delete /Library/Preferences/com.apple.mDNSResponder.plist
   2] sudo reboot

To view the current options set, here is what the user should do
   1] plutil -p /Library/Preferences/com.apple.mDNSResponder.plist
   OR
   1] sudo defaults read /Library/Preferences/com.apple.mDNSResponder.plist