iptables

/etc/sysconfig/iptables

iptables -s
iptables -A INPUT -p tcp -m state --state new -m tcp --dport 443 -j ACCEPT
iptables -A INPUT -p tcp -m state --state new -m tcp --dport 6889 -j ACCEPT

iptables -L -n -v #查看定义规则的详细信息

#iptables -L
#service iptables start

内容：

# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT