Prevent locked by iptables rules

*/10 * * * * /root/cikon/allow.sh
#!/bin/sh
/sbin/iptables -F
/sbin/iptables --flush
/sbin/iptables --table nat --flush
/sbin/iptables --delete-chain
/sbin/iptables --table nat --delete-chain  

#2nd way to write into allo.sh

#!/bin/sh
/sbin/iptables -F
/sbin/iptables -F -t nat
/sbin/iptables -F -t mangle
/sbin/iptables -P INPUT ACCEPT
/sbin/iptables -P OUTPUT ACCEPT
/sbin/iptables -P FORWARD ACCEPT