如何配置Ubuntu 14.04中的IPTables防火墙

# whereis iptables #查看系统清卖是否安装防火墙可以看到:

iptables: /sbin/iptables /usr/share/iptables /usr/share/man/man8/iptables.8.gz #表示已经安装iptables

apt-get install iptables #如果默认没有安装，请运行此命令安装防火墙

# iptables -L #查看防火墙配置信消慧息，显示如下:

Chain INPUT (policy ACCEPT)

target prot opt source destination

Chain FORWARD (policy ACCEPT)

target prot opt source destination

Chain OUTPUT (policy ACCEPT)

target prot opt source destination

# vi /etc/iptables/rules.v4

添加以下内容(备注:80是指web服务器端口,3306是指MySQL数据库链接端口,22是指SSH远程管理端口.)

*filter

:INPUT DROP [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

:syn-flood - [0:0]

-A INPUT -i lo -j ACCEPT

-A INPUT -m state --state RELATED,ESTABLISHED -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 -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT

-A INPUT -p icmp -m limit --limit 100/sec --limit-burst 100 -j ACCEPT

-A INPUT -p icmp -m limit --limit 1/s --limit-burst 10 -j ACCEPT

-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j syn-flood

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A syn-flood -p tcp -m limit --limit 3/sec --limit-burst 6 -j RETURN

-A syn-flood -j REJECT --reject-with icmp-port-unreachable

COMMIT

# iptables-restore </etc/iptables/rules.v4 #使防火墙规则生效

# vi /etc/network/答桥逗if-pre-up.d/iptables #创建文件，添加以下内容，使防火墙开机启动

#!/bin/bash

iptables-restore </etc/iptables/rules.v4

# chmod +x /etc/network/if-pre-up.d/iptables #添加执行权限

# iptables -L -n查看规则是否生效.

我在centos下的物铅或时候找到：

/etc/sysconfig/iptables

有时候会编辑它，或者备份

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Ubuntu又是放在哪个目录，叫什么名字呢

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正在尝试

# find / -name iptables

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root@honwhy:/etc# find / -name iptables

/usr/share/lintian/overrides/iptables

/usr/share/iptables

/usr/share/ufw/iptables

/激乎usr/share/doc/iptables

/sbin/iptables

/etc/bash_completion.d/罩伍iptables

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