iptables -I FORWARD -o enp0s31f6 -d 192.168.0.0/16 -j REJECT;
iptables -I FORWARD -o enp0s31f6 -d 172.16.0.0/12 -j REJECT;
iptables -I FORWARD -o enp0s31f6 -d 10.0.0.0/8 -j REJECT;
iptables -I INPUT -i enp0s31f6 -s 192.168.0.0/16 -j REJECT;
iptables -I INPUT -i enp0s31f6 -s 172.16.0.0/12 -j REJECT;
iptables -I INPUT -i enp0s31f6 -s 10.0.0.0/8 -j REJECT;
iptables -I OUTPUT -o enp0s31f6 -d 192.168.0.0/16 -j REJECT;
iptables -I OUTPUT -o enp0s31f6 -d 172.16.0.0/12 -j REJECT;
iptables -I OUTPUT -o enp0s31f6 -d 10.0.0.0/8 -j REJECT;