postup: iptables -A FORWARD -i nm-testNET -j ACCEPT; iptables -t nat -A POSTROUTING -o enxb827ebf0b53e -j MASQUERADE postdown: iptables -D FORWARD -i nm-testNET -j ACCEPT; iptables -t nat -D POSTROUTING -o enxb827ebf0b53e -j MASQUERADE