linux - 无法使用 iptables-restore 应用防火墙规则

Question

以下是我的 iptables 的配置，

[root@fabulous ~]# vi /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Mon Dec 23 15:55:09 2013
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m tcp --dport 53 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 53 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

但是，当我重新启动它时，我收到如下错误，作为通知，失败的行是“COMMIT”。谁能帮忙指出错误在哪里吗？提前致谢。

[root@fabulous ~]# service iptables restart
iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Unloading modules:                               [  OK  ]
iptables: Applying firewall rules: iptables-restore: line 20 failed
                                                           [FAILED]

Answer 1

我想说，这一行中缺少 -m TCP:

-A RH-Firewall-1-INPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT

您通常可以通过 iptables-restore 自行应用规则来获得一些线索:

iptables-restore < /etc/sysconfig/iptables

编辑:发现它，第 11 行

-A RH-Firewall-1-INPUT -p udp -m tcp --dport 53 -j ACCEPT

您正在为 tcp 模块指定 udp 协议(protocol)。您的意思可能是:

-A RH-Firewall-1-INPUT -p udp -m udp --dport 53 -j ACCEPT