-/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
+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