-iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
-iptables -A FORWARD -i eth0 -o $ETUN1 -m state --state RELATED,ESTABLISHED -j ACCEPT
-iptables -A FORWARD -i $ETUN1 -o eth0 -j ACCEPT
+/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
+/sbin/iptables -A FORWARD -i eth0 -o $ETUN1 -m state --state RELATED,ESTABLISHED -j ACCEPT
+/sbin/iptables -A FORWARD -i $ETUN1 -o eth0 -j ACCEPT