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iptables的使用

# iptables filter表

 

- iptables -F #清空所有規則

- service iptables save #保存規則

- iptables -t nat #-t指定表

- iptables -Z #將計數器清零

- iptables -A INPUT -s 192.168.188.1 -p tcp --sport 1234 -d 192.168.188.128 --dport 80 -j DROP

- iptables -I/-A/-D INPUT -s 1.1.1.1 -j DROP

- iptables -I INPUT -s 192.168.1.0/24 -i eth0 -j ACCEPT

- iptables -nvL --line-numbers

- iptables -D INPUT 1

- iptables -P INPUT DROP

 

 

 

 

 

 

```

[root@localhost ~]# iptables -nvL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

  193 12868 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

6   552 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

   10  2365 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 112 packets, 12324 bytes)

 pkts bytes target     prot opt in     out     source               destination         

```

iptables規則記錄在/etc/sysconfig/iptables的配置文件中

```

[root@localhost ~]# cat /etc/sysconfig/iptables

# sample configuration for iptables service

# you can edit this manually or use system-config-firewall

# please do not ask us to add additional ports/services to this default configuration

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -i lo -j ACCEPT

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT

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

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

COMMIT[root@localhost ~]# iptables -F

```

```

[root@localhost ~]# iptables -nvL

Chain INPUT (policy ACCEPT 6 packets, 428 bytes)

 pkts bytes target     prot opt in     out     source               destination         

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

 

Chain OUTPUT (policy ACCEPT 4 packets, 448 bytes)

 pkts bytes target     prot opt in     out     source               destination

[root@localhost ~]# cat /etc/sysconfig/iptables

# sample configuration for iptables service

# you can edit this manually or use system-config-firewall

# please do not ask us to add additional ports/services to this default configuration

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

-A INPUT -p icmp -j ACCEPT

-A INPUT -i lo -j ACCEPT

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT

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

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

COMMIT

 

```

重啟服務，iptables規則重置

```

[root@localhost ~]# service iptables restart

Redirecting to /bin/systemctl restart iptables.service

[root@localhost ~]# iptables -nvL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

8   576 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 5 packets, 716 bytes)

 pkts bytes target     prot opt in     out     source               destination

[root@localhost ~]# service iptables save

 

```

 

```

[root@localhost ~]# iptables -t filter -nvL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

   68  4536 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

1   229 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 38 packets, 5024 bytes)

 pkts bytes target     prot opt in     out     source               destination

[root@localhost ~]# iptables -t nat -nvL

Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

 

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

 

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

 

Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination

```

iptables -Z #將計數器清零pkts和bytes

```

[root@localhost ~]# iptables -Z ; iptables -nvL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination

```

 

[root[@localhost](https://my.oschina.net/u/570656) ~]# iptables -A INPUT -s 192.168.188.1 -p tcp --sport 1234 -d 192.168.188.128 --dport 80 -j DROP/REJECT

 

iptables -A #插入到后面

```

[root@localhost ~]# iptables -A INPUT -s 192.168.188.1 -p tcp --sport 1234 -d 192.168.188.128 --dport 80 -j DROP

[root@localhost ~]# iptables -nvL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

  354 23684 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

   13  1196 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

  383 47064 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

0     0 DROP       tcp  --  *      *       192.168.188.1        192.168.188.128      tcp spt:1234 dpt:80

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 23 packets, 2212 bytes)

 pkts bytes target     prot opt in     out     source               destination

```

> 0     0 DROP       tcp  --  *      *       192.168.188.1        192.168.188.128      tcp spt:1234 dpt:80

 

iptables -I #插入到前面

```

[root@localhost ~]# iptables -I INPUT -p tcp --dport 80 -j DROP

[root@localhost ~]# iptables -nvL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:80

  513 35132 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

   13  1196 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

  384 47308 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

0     0 DROP       tcp  --  *      *       192.168.188.1        192.168.188.128      tcp spt:1234 dpt:80

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 7 packets, 1156 bytes)

 pkts bytes target     prot opt in     out     source               destination

 

```

iptables -D #刪除

```

[root@localhost ~]# iptables -D INPUT -p tcp --dport 80 -j DROP

[root@localhost ~]# iptables -nvL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

  605 42492 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

   17  1564 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

  672 75245 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

0     0 DROP       tcp  --  *      *       192.168.188.1        192.168.188.128      tcp spt:1234 dpt:80

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 19 packets, 1972 bytes)

 pkts bytes target     prot opt in     out     source               destination  

[root@localhost ~]# iptables -D INPUT -s 192.168.188.1 -p tcp --sport 1234 -d 192.168.188.128 --dport 80 -j DROP

[root@localhost ~]# iptables -nvL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

  744 55092 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

   18  1656 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

  673 75489 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 17 packets, 1628 bytes)

 pkts bytes target     prot opt in     out     source               destination  

```

> 刪除iptables的規則，但是重新書寫一條規則或許太麻煩或者忘記規則的寫法時

 

```

 

[root@localhost ~]# iptables -A INPUT -s 192.168.188.1 -p tcp --sport 1234 -d 192.168.188.128 --dport 80 -j DROP

[root@localhost ~]# iptables -I INPUT -p tcp --dport 80 -j DROP

[root@localhost ~]# iptables -nvL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:80

  912 70948 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

   18  1656 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

  674 75718 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

0     0 DROP       tcp  --  *      *       192.168.188.1        192.168.188.128      tcp spt:1234 dpt:80

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 7 packets, 1364 bytes)

 pkts bytes target     prot opt in     out     source               destination

```

iptables -nvL --line-number

```

[root@localhost ~]# iptables -nvL --line-number

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

num   pkts bytes target     prot opt in     out     source               destination         

1        0     0 DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:80

2     1010 77416 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

3        0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

4        0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

5       18  1656 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

6      674 75718 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

7        0     0 DROP       tcp  --  *      *       192.168.188.1        192.168.188.128      tcp spt:1234 dpt:80

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

num   pkts bytes target     prot opt in     out     source               destination         

1        0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 59 packets, 7820 bytes)

num   pkts bytes target     prot opt in     out     source               destination

```

```

[root@localhost ~]# iptables -D INPUT 1

[root@localhost ~]# iptables -D INPUT 7

iptables: Index of deletion too big.

[root@localhost ~]# iptables -D INPUT 6

[root@localhost ~]# iptables -nvL --line-number

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

num   pkts bytes target     prot opt in     out     source               destination         

1     1165 87732 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

2        0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

3        0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

4       19  1748 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

5      674 75718 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

num   pkts bytes target     prot opt in     out     source               destination         

1        0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy ACCEPT 42 packets, 4056 bytes)

num   pkts bytes target     prot opt in     out     source               destination

```

 

iptables -P #默認規則

```

[root@localhost ~]# iptables -P OUTPUT DROP

```

 

> 終端使用DROP規則會使原本數據包在22端口通信，接收不了數據，在返回給客戶端再返回給終端，結果到達不了終端，然后接收不了數據就會導致斷開終端連接，解決辦法到主機上將規則改回ACCEPT

 

```

[root@localhost ~]# iptables -nvL --line-number

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)

num   pkts bytes target     prot opt in     out     source               destination         

1     1165 87732 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

2        0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           

3        0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           

4       19  1748 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            state NEW tcp dpt:22

5      674 75718 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

num   pkts bytes target     prot opt in     out     source               destination         

1        0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

 

Chain OUTPUT (policy DROP 37 packets, 24648 bytes)

num   pkts bytes target     prot opt in     out     source               destination

[root@localhost ~]# iptables -P OUTPUT ACCEPT

```

 

> -s #源ip

-p #指定協議

--sport #源端口號

-d #目標ip

--dport #目標端口號

-j #行為

 

 

#iptables小案例

 

```

vi /usr/local/sbin/iptables.sh

#!/bin/bash

ipt="/usr/sbin/iptables"

$ipt -F

$ipt -P INPUT DROP

$ipt -P OUTPUT ACCEPT

$ipt -P FORWARD ACCEPT

$ipt -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

$ipt -A INPUT -s 192.168.133.0/24 -p tcp --dport 22 -J ACCEPT

$ipt -A INPUT -p tcp --dprot 80 -j ACCEPT

$ipt -A INPUT -p tcp --dprot 21 -j ACCEPT

 

icmp示例

iptables -I INPUT -p icmp --icmp-type 8 -j DROP

 

```

 

 

```

[root@localhost ~]# vim /usr/local/sbin/iptables.sh

#!/bin/bash

ipt="/usr/sbin/iptables"

$ipt -F

$ipt -P INPUT DROP

$ipt -P OUTPUT ACCEPT

$ipt -P FORWARD ACCEPT

$ipt -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

$ipt -A INPUT -s 192.168.133.0/24 -p tcp --dport 22 -j ACCEPT

$ipt -A INPUT -p tcp --dport 80 -j ACCEPT

$ipt -A INPUT -p tcp --dport 21 -j ACCEPT

```

> 在tcp協議里ESTABLISHED是保持連接，RELATED狀態

 

```

[root@localhost ~]# w

 22:10:01 up 1 day, 20:48,  2 users,  load average: 0.00, 0.01, 0.05

USER     TTY        LOGIN@   IDLE   JCPU   PCPU WHAT

root     tty1      06:40   15:23m  0.42s  0.42s -bash

root     pts/0     21:50    1.00s  0.45s  0.00s w

[root@localhost ~]# sh /usr/local/sbin/iptables.sh

[root@localhost ~]# iptables -nvL

Chain INPUT (policy DROP 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

   28  1848 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     tcp  --  *      *       192.168.133.0/24     0.0.0.0/0            tcp dpt:22

0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:80

0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:21

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

 

Chain OUTPUT (policy ACCEPT 15 packets, 1428 bytes)

 pkts bytes target     prot opt in     out     source               destination

[root@localhost ~]# iptables -nvL

Chain INPUT (policy DROP 1 packets, 229 bytes)

 pkts bytes target     prot opt in     out     source               destination         

   41  2712 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED

0     0 ACCEPT     tcp  --  *      *       192.168.133.0/24     0.0.0.0/0            tcp dpt:22

0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:80

0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:21

 

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)

 pkts bytes target     prot opt in     out     source               destination         

 

Chain OUTPUT (policy ACCEPT 27 packets, 3628 bytes)

 pkts bytes target     prot opt in     out     source               destination  

[root@localhost ~]# service iptables restart #此命令為重啟iptables服務

Redirecting to /bin/systemctl restart iptables.service

```

> 可以看出pkts bytes的值正在增長

 

 

icmp案例

Windows

```

C:UsersAdministrator>ping 192.168.9.134


正在 Ping 192.168.9.134 具有 32 字節的數據:

來自 192.168.9.134 的回復: 字節=32 時間<1ms TTL=64

來自 192.168.9.134 的回復: 字節=32 時間<1ms TTL=64

來自 192.168.9.134 的回復: 字節=32 時間<1ms TTL=64

來自 192.168.9.134 的回復: 字節=32 時間<1ms TTL=64

 

192.168.9.134 的 Ping 統計信息:

    數據包: 已發送 = 4，已接收 = 4，丟失 = 0 (0% 丟失)，

往返行程的估計時間(以毫秒為單位):

    最短 = 0ms，最長 = 0ms，平均 = 0ms

```

Linux

```

[root@localhost ~]# iptables -I INPUT -p icmp --icmp-type 8 -j DROP

```

> 使icmp被禁止了，--icmp-type 8指icmp8種類型

 

Windows

```

C:UsersAdministrator>ping 192.168.9.134

 

正在 Ping 192.168.9.134 具有 32 字節的數據:

請求超時。

請求超時。

請求超時。

請求超時。

 

192.168.9.134 的

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