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Your ISP has its own DNS servers and automatically provides those when you connect to the Internet. The same thing happens when you connect to public networks in places like coffee shops, libraries, and hotels. That isn’t necessarily a problem, but if you’re concerned your ISP is tracking and selling your website requests, changing your DNS entries is the way to go. It also ensures the public networks you connect to don’t get to collect the URLs you enter. Changing Your Mac’s DNS Server Address You aren’t limited to the DNS servers your ISP or local coffee shop assigns.
Adding the servers you want takes only a few steps. Here’s how to add DNS servers to your Mac’s network settings:.
Go to Apple menu System Preferences. Choose Network. Select the network connection you want to modify. I started with my WiFi connection, then changed my Ethernet adapter connection, too.
If you use your passcode to lock down settings don’t forget to click the Padlock and authenticate. Click Advanced. New DNS server addresses show up at the bottom of the list, but you can drag them up higher.
When you’re done adding DNS addresses, click OK. Click Apply Your Mac starts at the top of the list to choose the DNS server it’ll use.
If for some reason the first isn’t available, your Mac moves on to the next. If none of those work, your Mac will look to your router for an entry. You can change the order of the entries in your DNS list with a quick click and drag. To remove an address, just select it and click the Minus button at the bottom of the DNS Servers list.
IPhone, iPad, and iPod touch owners can set DNS servers, too. Andrew Orr does a great job of. DNS Server Alternatives Now that you know how to change the DNS server entries on your Mac, here are some options to choose from, like OpenDNS and: Google.
8.8.8.8. 8.8.4.4. 208.67.220.220. 208.67.222.222.
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9.9.9.9. 1.1.1.1. 1.0.0.1.
Further Reading Recently, there has been a lot of about the current state of Apple's software quality. Anyone with even a passing familiarity with development knows that bugs are par for the course, and most people aren't bothered by small, day-to-day bugs that are fixed within a reasonable timeframe. Obviously, like everyone else, Apple's software has its share of those.
But there's another category of bug—glaring, perplexing bugs that couldn't possibly have escaped the attention of the software engineers in question, let alone the quality assurance department. Such issues exist, and sometimes they go unfixed for months. Hopefully, the set of network issues with OS X 10.10 described below won't fall into this column, but they do raise an obvious question: why? For 12 years, the mDNSResponder service managed a surprisingly large part of our Mac's networking, and it managed this task well. But as of OS X 10.10, the mDNSResponder has been replaced with discoveryd, which does the same thing.
Here are some strange networking problems we've observed since installing 10.10: Random failures to resolve DNS names. This is rare, but every once in a while, Safari stops loading any and all websites. Turns out that the OS X DNS resolver has stopped working. (Command line tools such as nslookup, host, or dig still work because those use their own DNS lookup code.) Duplicate machine names. We use an old Mac named 'nirrti' as a file- and iTunes server. In the pre-10.10 days, once in a blue moon nirrti would rename herself to 'nirrti (2)', presumably because it looked like another machine was already using the name 'nirrti'.
Under 10.10, this now happens a lot, sometimes getting all the way to nirrti (7). Changing back the computer name in the Sharing pane of the System Preferences usually doesn't take. Apart from looking bad, this also makes opening network connections and playing iTunes content harder, as you need to connect to the right version of the name or nothing happens.
/ Duplicate iTunes libraries in the iOS Remote app. Very inconsistent wake on demand. In OS X 10.6, Apple introduced the 'wake on demand' feature where a sleeping Mac automatically wakes up when it gets accessed over the network. This is great, because now you can let a computer that functions as a server sleep. Before 10.10, this worked reasonably well. Usually, our Apple TV would play content from the iTunes library on nirrti without trouble.
But as of OS X 10.10, wake on demand sometimes works for a while, but most of the time it doesn't. Impossible to reach services running on a Mac from the outside.
When on the road, we like to share the screen of a home Mac to monitor the progress of ongoing downloads and the like. Under 10.10, this wouldn't work at all over IPv4, only over IPv6. Very flakey registration. In order to connect to that home machine, we have to register its name and services using Wide Area Bonjour/dynamic DNS updates.
Again, pre-10.10 this worked fairly reliably, but under 10.10 it's hit-and-miss, with more 'miss' than 'hit'. At first blush, you'd assume that these were all separate, smaller problems. However, that's not the case. MDNSResponder versus discoveryd Resolving DNS names, resolving Bonjour machine names, resolving Bonjour service advertisement and discovery, and opening ports in NAT gateways to allow incoming network connections are all jobs that have been performed by the mDNSResponder daemon. This was introduced with Mac OS X 10.2 Jaguar back in 2002. MDNSResponder is written in C and has been released as open source by Apple, and it has found its way to all kinds of non-Apple operating systems and hardware. Again, as of OS X 10.10, mDNSResponder has been replaced by discoveryd.
Curiously, discoveryd is (re)written in C, not exactly one of Apple's favorite languages. And apparently, the responsible people at Apple haven't been reading their. As per Joel Spolsky's dire warnings against rewriting software from scratch, discoveryd has its share of bugs. For instance, when the system is unable to resolve DNS names, discoveryd log messages indicate that it doesn't recognize the replies from the DNS server to its own requests. Discoveryd is also a frequent guest in the CrashReporter logs. One of the functions of the mDNSResponder was to talk to a home gateway and ask it to forward incoming network connections for any services running on the Mac in question. In the non-Apple world, this is done with the uPnP IGD protocol, and Apple had its own NAT-PMP protocol for this.
More recently, the IETF has standardized PCP, a new protocol that and firewalls, not just IPv4 and Network Address Translation (NAT) as used by home routers. MDNSResponder supported all of them, but it looks like discoveryd doesn't use any of them. As such, if you enable screen sharing on your Mac and try to connect to it from elsewhere on the Internet, your home router doesn't know where to send the incoming request.
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Thus, the screen remains unshared. If discoveryd isn't doing its job properly, sometimes it helps to restart it. However, even this doesn't always work, and restarting discoveryd gets old fast. If you're not scared of a little command line hacking, there's a better solution: you can reinstall the OS X 10.9 mDNSResponder on a 10.10 system. And after that, all the problems listed above magically go away. Restoring mDNSResponder, if you dare First a word of warning: if something goes wrong, your Mac may not be able to boot.
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This can be fixed by and re-enabling discoveryd (see below). Be sure you have a recent backup just in case, and only follow the steps below if you are prepared to boot into single user mode if needed. The first thing you need to do is find copies of 10.9 mDNSResponder, mDNSResponderHelper, and their plist files. On a 10.9 system, they're found in /usr/sbin/ and /System/Library/LaunchDaemons, respectively. These Terminal commands will copy them to the desktop for easy copying to the 10.10 system on which you want to install them: cd /Desktop/ cp /usr/sbin/mDNSResponder. Cp /usr/sbin/mDNSResponderHelper.
Cp /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist. Cp /System/Library/LaunchDaemons/com.apple.mDNSResponderHelper.plist. Another way to get the mDNSResponder and its helper is from a Time Machine backup. Connect your Time Machine drive or click on the backup image on your (Time Capsule) network drive.
Wouldn't this run a risk of perpetually introducing 10.9 security problem or bugs into 10.10; bugs which will never be patched? Also, a future OS X update may go bad in a spectacular fashion. Apple has a consistent hardware and software platform to work with, and unlike other vendors dealing with a thousand different configurations, they do not run extensive patch testing or prerequisite checks prior to install because they don't need to.
Update installer blows up if it doesn't find what it expects. 19504 posts registered Mar 15, 2002. Associate Writer.