thumb How to fix the issue if you see the message about the host is unknown when attempting to ping a domain name.

I can ping one of Google’s servers:

$ ping
PING ( 56(84) bytes of data.
64 bytes from icmp_req=1 ttl=51 time=8.09 ms
64 bytes from icmp_req=2 ttl=51 time=8.34 ms
64 bytes from icmp_req=3 ttl=51 time=12.4 ms

But I can’t resolve any domain names:

$ ping
ping: unknown host

This means that resolving of the domain names to IP via DNS (Domain Name System) is not working.

To fix this, simply type the following command:

echo "nameserver" | sudo tee /etc/resolv.conf

Or you can manual edit the resolv.conf file. For this you need to open the resolv.conf file:

sudo nano /etc/resolv.conf

And add this line instead of what ever you have:


Note: - is a Google DNS servers.

Arthur Gareginyan

Arthur Gareginyan

Arthur is a designer and full stack software engineer. He is the founder of His personal website can be found at Check out his free WordPress plugins at

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