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NetworkManager

/etc/resolv.conf -> DNS:208.67.222.222 ^ 208.67.222.222

nmcli - command-line tool for controlling NetworkManager

Restart NetworkManager

service NetworkManager restart

Up Down

nmcli con down <connectionName>
nmcli con up <connectionName>

Ignore and Set IPv4

nmcli con mod "$connectionName" ipv4.ignore-auto-dns yes

nmcli con mod "$connectionName" ipv4.dns "8.8.8.8 8.8.4.4"

nmcli con mod "$connectionName" ipv4.dns "208.67.222.222 208.67.222.222"

Shell From nmcli

nmcli -g name,type connection  show  --active | awk -F: '/ethernet|wireless/ { print $1 }' | while read connection
do
  nmcli con mod "$connection" ipv6.ignore-auto-dns yes
  nmcli con mod "$connection" ipv4.ignore-auto-dns yes
  nmcli con mod "$connection" ipv4.dns "8.8.8.8 8.8.4.4"
  nmcli con mod "$connectionName" ipv4.dns "208.67.222.222 208.67.222.222"
  nmcli con down "$connection" && nmcli con up "$connection"
done