iptables的设定
iptables-save用来把当前的规则存入一个文件里以备iptables-restore使用。它的数设使用很简单,只有两个参数:
- iptables-save [-c] [-t table]
参数-c的参定作用是保存包和字节计数器的值。这可以使我们在重启防火墙后不丢失对包和字节的数设统计。带-c参数的参定iptables-save命令使重启防火墙而不中断统计记数程序成为可能。这个参数默认是数设不使用的。
参数-t指定要保存的参定表,默认是数设保存所有的表。下面给出未装载任何规则的参定情况下iptables-save的输出。
- # Generated by iptables-save v1.2.6a on Wed Apr 24 10:19:17 2002
- *filter
- :INPUT ACCEPT [404:19766]
- :FORWARD ACCEPT [0:0]
- :OUTPUT ACCEPT [530:43376]
- COMMIT
- # Completed on Wed Apr 24 10:19:17 2002
- # Generated by iptables-save v1.2.6a on Wed Apr 24 10:19:17 2002
- *mangle
- :PREROUTING ACCEPT [451:22060]
- :INPUT ACCEPT [451:22060]
- :FORWARD ACCEPT [0:0]
- :OUTPUT ACCEPT [594:47151]
- :POSTROUTING ACCEPT [594:47151]
- COMMIT
- # Completed on Wed Apr 24 10:19:17 2002
- # Generated by iptables-save v1.2.6a on Wed Apr 24 10:19:17 2002
- *nat
- :PREROUTING ACCEPT [0:0]
- :POSTROUTING ACCEPT [3:450]
- :OUTPUT ACCEPT [3:450]
- COMMIT
- # Completed on Wed Apr 24 10:19:17 2002
我们来解释一下这个输出格式。数设#后面的参定是注释。表都以*
上面的例子是最基本的,我想用一个简短的例子说明会更好,其中包含一个非常小的规则集Iptables-save ruleset。iptables-save的输出如下:
- # Generated by iptables-save v1.2.6a on Wed Apr 24 10:19:55 2002
- *filter
- :INPUT DROP [1:229]
- :FORWARD DROP [0:0]
- :OUTPUT DROP [0:0]
- -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
- -A FORWARD -i eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
- -A FORWARD -i eth1 -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
- -A OUTPUT -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
- COMMIT
- # Completed on Wed Apr 24 10:19:55 2002
- # Generated by iptables-save v1.2.6a on Wed Apr 24 10:19:55 2002
- *mangle
- :PREROUTING ACCEPT [658:32445]
- :INPUT ACCEPT [658:32445]
- :FORWARD ACCEPT [0:0]
- :OUTPUT ACCEPT [891:68234]
- :POSTROUTING ACCEPT [891:68234]
- COMMIT
- # Completed on Wed Apr 24 10:19:55 2002
- # Generated by iptables-save v1.2.6a on Wed Apr 24 10:19:55 2002
- *nat
- :PREROUTING ACCEPT [1:229]
- :POSTROUTING ACCEPT [3:450]
- :OUTPUT ACCEPT [3:450]
- -A POSTROUTING -o eth0 -j SNAT --to-source 195.233.192.1
- COMMIT
- # Completed on Wed Apr 24 10:19:55 2002
每个命令前都有包和字节计数器,这说明使用了-c参数。除了有计数器,其他的都和普通的脚本一样。现在的问题是怎么把输出保存到文件中。非常简单,既然使用linux,你应该早就知道了,用重定向啊:
iptables-save -c > /etc/iptables-save
这就会把规则集保存到/etc/iptables-save中,而且还有计数器。
【编辑推荐】
iptables内核配置
Iptables相关命令说明
Iptables相关命令
责任编辑:zhaolei 来源: lupaworld iptables设定(责任编辑:综合)
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