iptables -t filter -P INPUT -j DROP or iptables -t filter -P INPUT -j REJECT or iptables -t filter -P INPUT -j ACCEPT or iptables -t filter -P output -j DROP
iptables -t filter -P INPUT -j DROP or iptables -t filter -P INPUT -j REJECT or iptables -t filter -P INPUT -j ACCEPT or iptables -t filter -P output -j DROP