标签：
iptables很强大，这只是介绍我小小的fllow debian wiki 然后简单的设置了下iptables，以后再根据需求具体设置
首先 (查看当前iptables配置，我装的debian默认安装了)
sudo iptables -L
如果没配置过的话，输出是（什么作用都没起到）
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
接下来开始配置rules ,在新建的文件里面写配置
vim /etc/iptables.test.rules
然后输入
*filter # Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn‘t use lo0 -A INPUT -i lo -j ACCEPT -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT # Accepts all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allows all outbound traffic # You could modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allows HTTP and HTTPS connections from anywhere (the normal ports for websites) -A INPUT -p tcp --dport 80 -j ACCEPT -A INPUT -p tcp --dport 443 -j ACCEPT # Allows SSH connections # The --dport number is the same as in /etc/ssh/sshd_config -A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT # Now you should read up on iptables rules and consider whether ssh access # for everyone is really desired. Most likely you will only allow access from certain IPs. # Allow ping # note that blocking other types of icmp packets is considered a bad idea by some # remove -m icmp --icmp-type 8 from this line to allow all kinds of icmp: # https://security.stackexchange.com/questions/22711 -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT # log iptables denied calls (access via ‘dmesg‘ command) -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy: -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT
上面是官方给的配置实例，具体参数有说明
这里有一个介绍参数的https://help.ubuntu.com/community/IptablesHowTo
我实际只留下四条，以后根据自己需求再改吧
配置文件写好之后就可以运行下面的命令来使用这些rules
sudo iptables-restore < /etc/iptables.test.rules
然后可以
iptables -L 查看配置前后不同的地方
最后设置开机启动（开机将写好的rules激活）
vim /etc/network/if-pre-up.d/iptables
写入..
#!/bin/sh sudo /sbin/iptables-restore < /etc/iptables.up.rules
然后
sudo chmod +x /etc/network/if-pre-up.d/iptables
可以啦
标签：
原文地址：http://www.cnblogs.com/Hsin/p/4251523.html
