iptables 学习总结--规则管理(三)

冷不防 2022-05-23 04:51 221阅读 0赞

## 查看规则 ##

[root@localhost ~]# iptables -t filter -nvL INPUT --line
    Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
    num   pkts bytes target     prot opt in     out     source               destination         
    1      369 32355 ACCEPT     all  -- * * 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
    2        0     0 ACCEPT     all  -- lo * 0.0.0.0/0 0.0.0.0/0 
    3       11  1961 INPUT_direct  all  -- * * 0.0.0.0/0 0.0.0.0/0 
    4       11  1961 INPUT_ZONES_SOURCE  all  -- * * 0.0.0.0/0 0.0.0.0/0 
    5       11  1961 INPUT_ZONES  all  -- * * 0.0.0.0/0 0.0.0.0/0 
    6        0     0 DROP       all  -- * * 0.0.0.0/0 0.0.0.0/0 ctstate INVALID
    7       10  1897 REJECT     all  -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

清除规则

[root@localhost ~]# iptables -t filter -F INPUT
    [root@localhost ~]# iptables -t filter -nvL INPUT --line
    Chain INPUT (policy ACCEPT 9 packets, 636 bytes)
    num   pkts bytes target     prot opt in     out     source               destination

ping 该主机  
![111][]

## 新增规则 ##

[root@localhost ~]# iptables -t filter -I INPUT -s 192.168.1.39 -j DROP [root@localhost ~]# iptables -t filter -nxL INPUT Chain INPUT (policy ACCEPT) target prot opt source destination DROP all -- 192.168.1.39 0.0.0.0/0

ping不通  
![1111][]

-I --表示添加 -s 表示源地址 -j --表示执行的动作

[root@localhost ~]# iptables -t filter -nxvL INPUT
    Chain INPUT (policy ACCEPT 41 packets, 3289 bytes)
        pkts      bytes target     prot opt in     out     source               destination
         231    19404 DROP       all  --  *      *       192.168.1.39         0.0.0.0/0

APPEND 追加规则不生效,原因是同一个规则，只要在最前面才生效

[root@localhost ~]# iptables -t filter -A INPUT -s 192.168.1.39 -j ACCEPT
    [root@localhost ~]# iptables -t filter -nxvL INPUT
    Chain INPUT (policy ACCEPT 7 packets, 488 bytes)
        pkts      bytes target     prot opt in     out     source               destination
         393    33012 DROP       all  --  *      *       192.168.1.39         0.0.0.0/0
           0        0 ACCEPT     all  --  *      *       192.168.1.39         0.0.0.0/0

添加的方式加规则，通了  
![22][]

[root@localhost ~]# iptables -t filter -nxvL INPUT
    Chain INPUT (policy ACCEPT 8 packets, 588 bytes)
        pkts      bytes target     prot opt in     out     source               destination
          74     6216 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0
         595    49980 DROP       all  -- * * 192.168.1.39 0.0.0.0/0
           0        0 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0

指定添加规则位置

[root@localhost ~]# iptables -t filter -I INPUT 1 -s 192.168.1.39 -j DROP

![123][]

## 删除规则 ##

两种方式删除  
**1.根据规则号去删除**

[root@localhost ~]# iptables -t filter -nxvL INPUT --line
    hain INPUT (policy ACCEPT 9 packets, 636 bytes)
    num      pkts      bytes target     prot opt in     out     source               destination
    1         298    25032 DROP       all  -- * * 192.168.1.39 0.0.0.0/0
    2         157    13188 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0
    3         595    49980 DROP       all  -- * * 192.168.1.39 0.0.0.0/0
    4           0        0 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0
    
    [root@localhost ~]# iptables -t filter -D INPUT 1
    [root@localhost ~]# iptables -t filter -nxvL INPUT --line
    Chain INPUT (policy ACCEPT 7 packets, 488 bytes)
    num      pkts      bytes target     prot opt in     out     source               destination
    1         163    13692 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0
    2         595    49980 DROP       all  -- * * 192.168.1.39 0.0.0.0/0
    3           0        0 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0

**2.根据具体的比配条件以及动作删除**

[root@localhost ~]# iptables -t filter -nxvL INPUT --line
    Chain INPUT (policy ACCEPT 19 packets, 1352 bytes)
    num      pkts      bytes target     prot opt in     out     source               destination
    1         286    24024 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0
    2         595    49980 DROP       all  -- * * 192.168.1.39 0.0.0.0/0
    3           0        0 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0
    
    [root@localhost ~]# iptables -t filter -D INPUT -s 192.168.1.39 -j ACCEPT
    [root@localhost ~]# iptables -t filter -nxvL INPUT --line
    Chain INPUT (policy ACCEPT 7 packets, 488 bytes)
    num      pkts      bytes target     prot opt in     out     source               destination
    1         599    50316 DROP       all  -- * * 192.168.1.39 0.0.0.0/0
    2           0        0 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0

删除某张表的所有的规则

iptables -t filter -F

删除某张表的对应的链下的所有的规则

iptables -t filter -F INPUT

## 修改规则 ##

![111][111 1]

[root@localhost ~]# iptables -t filter -nxL INPUT --line
    Chain INPUT (policy ACCEPT)
    num  target     prot opt source               destination
    1    ACCEPT     all  -- 192.168.1.39 0.0.0.0/0
    2    ACCEPT     all  -- 192.168.1.39 0.0.0.0/0

![1111][1111 1]

修改默认策略`iptables -t 表 -P 链 动作`

[root@localhost ~]# iptables -t filter -nxvL INPUT --line
    Chain INPUT (policy ACCEPT 20 packets, 1424 bytes)
    num      pkts      bytes target     prot opt in     out     source               destination
    1         124    10416 REJECT     all  -- * * 192.168.1.39 0.0.0.0/0 reject-with icmp-port-unreachable
    2           0        0 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0

[root@localhost ~]# iptables -t filter -P INPUT DROP

![11111][]

iptables -t filter -P INPUT  ACCEPT

[root@localhost ~]# iptables -t filter -xnvL INPUT
    Chain INPUT (policy ACCEPT 92 packets, 8623 bytes)
        pkts      bytes target     prot opt in     out     source               destination
         444    37296 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0
           0        0 ACCEPT     all  -- * * 192.168.1.39 0.0.0.0/0

## 保存规则 ##

上面所做的操作都是临时的，重启就失效了，所以得保存起来

配置好yum源以后安装iptables-service
    # yum install -y iptables-services
    #停止firewalld
    # systemctl stop firewalld
    #禁止firewalld自动启动
    # systemctl disable firewalld
    #启动iptables
    # systemctl start iptables
    #将iptables设置为开机自动启动，以后即可通过iptables-service控制iptables服务
    # systemctl enable iptables
    
    [root@localhost ~]# service iptables save
    iptables: Saving firewall rules to /etc/sysconfig/iptables:[  确定  ]
    cat /etc/sysconfig/iptables

iptables-save >/etc/sysconfig/iptables

重载iptable

iptables-restore </etc/sysconfig/iptables

参考：  
[规则管理][Link 1]

[111]: /images/20220523/50c44ee2882e47b9b9d70145de2aa713.png
[1111]: /images/20220523/76e488f02e0948e7b7fa4cfbd8062a13.png
[22]: /images/20220523/aba1f449b7fa46de832bff971693e2dc.png
[123]: /images/20220523/f2ca8e3f0edf4082ab2ca5be046cace8.png
[111 1]: /images/20220523/d84bcfa5e957425b91ef196291927011.png
[1111 1]: /images/20220523/b2fc60674ede4b1db7820982e8c22233.png
[11111]: /images/20220523/e32e95752ef34b0b85f6358636e8bb5b.png
[Link 1]: http://www.zsythink.net/archives/1517