Ubuntu 防火墙

• 应用编写的防火墙规则：

iptables-restore < /etc/iptables/rules.v6

• 在 INPUT 表指定位置添加一条规则：

iptables -I INPUT 6 -p tcp -m state --state NEW -m tcp --dport 8082 -j ACCEPT

• /etc/iptables/rules.v4

# Generated by iptables-save v1.4.21 on Fri Aug 12 20:35:24 2016
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Fri Aug 12 20:35:24 2016

• /etc/iptables/rules.v4

# Generated by ip6tables-save v1.4.21 on Fri Aug 12 20:35:24 2016
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT
# Completed on Fri Aug 12 20:35:24 2016