If you’re using Ubuntu 18.04+ (or distro based on Ubuntu 18.04) and you would like to know which DNS servers are responsible for your connection, you can try the next options:
Option 1
nmcli dev show | grep DNS |
Response:
IP4.DNS[1]: 192.168.15.15 IP4.DNS[2]: 192.168.15.16 IP4.DNS[3]: 192.168.15.17 |
Option 2
systemd-resolve --status |
Response:
....
DNS Servers: 192.168.15.15
192.168.15.16
192.168.15.17
DNS Domain: ~. |
It contains a list under “DNS Servers” organized by link
Option 3
cat /run/systemd/resolve/resolv.conf |
The well known file /etc/resolv.conf is now just a symlink to /run/systemd/resolve/stub-resolv.conf
If you want the “old way”, you can point /etc/resolv.conf directly to /run/systemd/resolve/resolv.conf