How can I change my DNS server from the Terminal on Mac OS X? [I need this because my DNS is not working correctly with my VPN. Sometimes it's using the DNS for my main connection, and sometimes it's using the DNS specified for the VPN (which it should).]
You can use scutil
interactively from the terminal. Run sudo scutil
and run these commands, swapping your DNS servers in where appropriate:
> open > d.init > d.add ServerAddresses * 8.8.8.8 9.9.9.9 > set State:/Network/Service/PRIMARY_SERVICE_ID/DNS > quit
Instead of using 8.8.8.8
and 9.9.9.9
use your DNS servers.
The only problem is this is not persistent across reboots. If you want permanent changes, you'll want ncutil. The reason editing /etc/resolv.conf
isn't sufficient in newer versions of OS X is because configd now uses a database to store information of current settings, which other applications read. Certain applications will still read /etc/resolv.conf
(host for example), although that is not the case for all applications.
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28.8.8.8 is a valid one, though. Google's Public DNS. 8.8.4.4 is the secondary. :-) – Forgotten Semicolon Dec 21 '09 at 19:03
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1
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2This does not seem to work on my Mac OSX 10.7.5 MBP, at least not when done literally. Should I replace anything in the
set State:/Network/Service/PRIMARY_SERVICE_ID/DNS
line or can I use that as it is ? Should the new DNS servers show up in thescutil --dns
output after the change ? – ssc Oct 30 '13 at 13:57 -
2@ssc Run
scutil
followed by> list
to find the key to replace PRIMARY_SERVICE_ID with. – J.Money Mar 31 '15 at 2:12
You can use networksetup
:
sudo networksetup -setdnsservers <networkservice> DNS1, DNS2, DNS3
eg (having the Airport connection use Google's DNS Servers)
sudo networksetup -setdnsservers AirPort 8.8.8.8 8.8.4.4
You can find out the name of the network service by running networksetup -listallnetworkservices
. It'll be 'Wi-Fi' probably.
This is the same as if you were to edit the entires in the Network Preference Pane in System Preferences, so it is persistent across reboots.
You may be running into a DNS issue on Snow Leopard that occurs when the order DNS servers are queried changes (see question 84144))
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Wow, 84144 is the problem I'm having. Still processing all of this.... thank you muchly! – Dan Rosenstark Dec 21 '09 at 21:52
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9One note to anyone wanting to remove the DNS, just write "empty" (without the quotes) instead of the DNS:
sudo networksetup -setdnsservers <networkservice> empty
– jackJoe Nov 29 '12 at 9:36 -
It is suggested that after changing the DNS is a good idea to flush caches:
sudo discoveryutil mdnsflushcache
. – Anastasios Andronidis Apr 23 '20 at 13:42
I don't have enough points to reply to Chealion's post but to add on to it I'd start with listing the interfaces
networksetup -listallnetworkservices
Once you have the interface you'd like to change you can do the below (I'm using the Wi-Fi but you can do any other interface)
sudo networksetup -setdnsservers Wi-Fi empty
sudo networksetup -setdnsservers Wi-Fi 8.8.8.8 8.8.4.4
sudo killall -HUP mDNSResponder
The first line of the above will empty out the DNS settings then follow it with the DNS servers we'd like to use and finely clear the DNS cache
To verify the DNS change you can do this before and after or simply after
scutil --dns | grep 'nameserver\[[0-9]*\]'
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Anyone that has stumbled across this page. I have a Gist on GitHub now that should help. gist.github.com/dkittell/34fe7b7422323fba546948b7448933a5 – David Kittell Jun 27 '19 at 18:30
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1Thanks David. Can you document an overview (that addresses purpose and/or other helpful context) of what the script (at your above gist) does and why/how/etc? – Johnny Utahh May 9 '20 at 3:10
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I believe I have a document already for that script, I'll see if I can find it – David Kittell Jun 4 '20 at 13:35
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1@JohnnyUtahh, please take a look at kittell.net/code/mac-osx-terminal-change-dns – David Kittell Jun 4 '20 at 17:15
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1Thanks @David Kittell, your follow-up and this script(s) is (are) very much appreciated. Thanks again! – Johnny Utahh Jun 5 '20 at 17:15
resolv.conf does not work on OSX anymore. There is a notice right at the top of that file as follows:
#
# macOS Notice
#
# This file is not consulted for DNS hostname resolution, address
# resolution, or the DNS query routing mechanism used by most
# processes on this system.
#
# To view the DNS configuration used by this system, use:
# scutil --dns
#
# SEE ALSO
# dns-sd(1), scutil(8)
#
# This file is automatically generated.
#
Also, networksetup -listallnetworkservices
does not list all VPN interfaces.
Here is one way to use scutil to target the right interface:
1. Create a file commands.txt
with your commands for the interactive scutil tool.
e.g. contents for Pulse secure interface in my case:
get State:/Network/Service/net.pulsesecure.pulse.nc.main/DNS
d.add ServerAddresses * 8.8.8.8 9.9.9.9
set State:/Network/Service/net.pulsesecure.pulse.nc.main/DNS
- Run scutil with the commands piped in. (You need sudo for
set
)
sudo scutil < commands.txt
You should be able to do it by editing /etc/resolv.conf (remember resolv.conf is reset after reboot), hope it helps - http://developer.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man5/resolver.5.html
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5As of older versions of OS X (10.2 and prior), that is the way to go. Not with newer releases though. – John T Dec 21 '09 at 19:06