...

9. echo "nameserver X.X.X.X" | sudo tee /etc/resolv.conf (Create resolv.conf and append the line.)

10. echo "nameserver X.X.X.X" | sudo tee -a /etc/resolv.conf (Append the line in resolv.conf)

...

12. sudo chattr +i /etc/resolv.conf

13. And finally in windows powershell with Administrative rights:

Image Added

Get-NetAdapter | Where-Object {$_.InterfaceDescription -Match "Cisco AnyConnect"} | Set-NetIPInterface -InterfaceMetric 6000

References