How to change DNS on Ubuntu command line?

How to set DNS by command line?

I have a router and I need to set the DNS IP of the router.

For this reason I open a command line and do sudo sh /etc/resolv.conf.

How can I save the content of resolv. The /etc/resolv.conf file has my ISP DNS IP. The default configuration was:
Nameserver 208.67.222
Nameserver 208.220
How can I change the content of my router to these DNSs? The way you're doing it is exactly how it should be done. If there are problems, most likely it's not the content of the config files that cause them. So it's something on your side that is causing problems, not on the network, like a malformed DHCP reply.

If it's not the DNS servers, then it's most likely some issue on your part with your network. The network is always the last step of troubleshooting, but it's never easy and you may find that this works just fine for you.

How to change DNS on Ubuntu command line?

- howtogeek

I just reinstalled my laptop and it seems I'm having trouble with DNS settings, as well.

Before (on Debian GNU/Linux), my machine automatically set up DNS records for the google domain and everything was OK, but on Ubuntu 18.10, I am not able to do so without some manual work. How can I change the DNS entries of ubuntu? I've tried to do it at installation with changing the interface to wired by command line but I am failing every time. Do anyone have some kind of a documentation about changing DNS? or maybe some examples?

I've found the answer from here how to fix ubuntu DNS (no nameserver config file)? I will put it in order of my solution. What you should do is: 1) check your /etc/resolv.conf to see if you are getting the DNS servers configured properly or by DHCP.

2) If you are indeed getting the DNS servers configured properly, then this means the /etc/network/interfaces file is still being used. So next time you connect an ethernet cable to your machine you can run a sudo dhclient (and you will notice that the default interface eth0 does not have a config). You should use a different iface for the configuration like enp0s20 or enp0s10, I personally find the one I have connected the most often (enp0s20) the more relevant to get into network manager because I have connected my eth0 to Wi-Fi, and my enp0s0 to my home network over WiFi sometimes.

This is a good tutorial how to make the changes persistent for every reboot: Permanent connection of static IP via DHCP. 3) After changing to wired and after restarting networking via sudo service networking restart you can try to enter: sudo ping 8.8 (this should now work as per you DNS server) 4) The only time you won't be able to use 8.8 is when if your DNS is being handled by your OS' DNS settings (which by the way is pretty weird). This is why step 1 is useful, otherwise you may notice nothing from your DNS changes. So go to the DNS settings in Network Connections of Ubuntu Gnome and try to switch to manual. Then try to use 8.

How do I change DNS to 8.8 8.8 in Linux?

I use a computer at home and another one at work.

Both of them have their own domain name and we are not able to access the web site at home if we type in the IP address. I checked the router and all of the ports are forwarded correctly. What is going on here? How do I change the DNS settings on both computers so that I can access the web site with my domain name? I don't know what else I can do to troubleshoot the problem. I am pretty new to all of this. The problem started when I got a new internet provider (Verizon FiOS) after the previous internet service went out.

You need to modify your system's hosts file. This file resides in /etc/hosts. Then add your new DNS settings to the file by adding them to the bottom (or end) of the file. So if your DNS settings were 1.2.3.4 and 1.5 then your host file would look like this:
#
# This file was generated by dhcpgeneratehostfile. # If you make changes to this file, you must regenerate it using. # dhcpgeneratehostfile --update. # Generated on Wed Aug 14 10:40:46 2026 UTC. # Host name 1.4 # Primary dns 1.4 # Alternate dns 1.4 # Primary interface eth0. # Alternate interface eth0.
The hosts file also exists for Windows as C:WindowsSystem32DriversEtcHosts.