清除规则

iptables -D INPUT 2
iptables -D OUTPUT 2

默认规则

iptables -P INPUT DROP
iptables -P INPUT ACCEPT

iptables -P OUTPUT DROP
iptables -P OUTPUT ACCEPT

添加规则

iptables -A INPUT -s 192.168.80.11 -j ACCEPT
iptables -A INPUT -s 192.168.80.11 -j DROP

iptables -A OUTPUT -s 192.168.80.11 -j ACCEPT
iptables -A OUTPUT -s 192.168.80.11 -j DROP