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-translating by lujun9972
-Learn how to use tcpdump command with examples
-======
-Tcpdump command is a famous network packet analysing tool that is used to display TCP\IP & other network packets being transmitted over the network attached to the system on which tcpdump has been installed. Tcpdump uses libpcap library to capture the network packets & is available on almost all Linux/Unix flavors.
-
-Tcpdump command can read the contents from a network interface or from a previously created packet file or we can also write the packets to a file to be used for later. One must use the tcpdump command as root or as a user with sudo privileges.
-
-In this tutorial, we are going to discuss the uses of tcpdump command along with some examples, but first let's start with installation of tcpdump on various Linux OS.
-
- **(Recommended Read:[Monitoring network bandwidth with iftop command][1])**
-
-### Installation
-
-By default, tcpdump is available on almost all Linux distributions but if that's not the case for you, install it on your system using the following method.
-
- **CentOS/RHEL**
-
-Install tcpdump on CentOS & RHEL using the following command ,
-
- **$ sudo yum install tcpdump**
-
- **Fedora**
-
-On Fedora, install tcpdump using the following command,
-
- **$ dnf install tcpdump**
-
- **Ubuntu/Debian/Linux Mint**
-
-On Ubuntu or Debian or Linux Mint, install tcp dumo using the following command,
-
- **$ apt-get install tcpdump**
-
-Now that we have install tcpdump on our systems, let's discuss some examples for tcpdump.
-
-### Examples
-
- **Get packets from all interfaces**
-
-To get the network packets from all network interfaces, run the following command,
-
- **$ tcpdump -i any**
-
-**Get packets from a single interfaces**
-
-To get the network packets from a single interface, use
-
- **$ tcpdump -i eth0**
-
-**Writing captured packets to file**
-
-To write all the captured packets to a file, use the '-w' option,
-
- **$ tcpdump -i eth1 -w packets_file**
-
-**Reading an old tcpdump file**
-
-To read an already created, old tcpdump file, use the following command,
-
- **$ tcpdump -r packets_file**
-
-**Getting more packets information with readable timestamps**
-
-To get more information regarding the packets along with readable timestamp, use
-
- **$ tcpdump -ttttnnvvS**
-
-**Check packets of whole network**
-
-To get the packets for whole network, execute the following command from terminal
-
- **$ tcpdump net 192.168.1.0/24**
-
-**Check packets based on IP address**
-
-Get all the packets based on the IP address, whether source or destination or both, using the following command,
-
- **$ tcpdump host 192.168.1.100**
-
-To get packets based on source or destination of an IP address, use
-
- **$ tcpdump src 192.168.1.100**
-
- **$ tcpdump dst 192.168.1.100**
-
-**Check packets for a protocol or port number**
-
-To check all the packets used based on the protocol, run the following command
-
- **$ tcpdump ssh**
-
-To get packets for a single port ot for a range of ports, use
-
- **$ tcpdump port 22**
-
- **$ tcpdump portrange 22-125**
-
-We can also use ** 'src'** & **' dst'** options to get packets for ports based on source & destination.
-
-We can also combine two conditions with AND (and , && ), OR ( or. || ) & EXCEPT (not , ! ). This helps when we have analyze network packets based on the some condtions.
-
-**Using AND**
-We can use  'and' or symbol '&&' to combine two conditions or mote with tcpdump. An example would be,
-
- **$ tcpdump src 192.168.1.100 && port 22 -w ssh_packets**
-
-**Using OR**
-
-OR will check the command agtcpdump -i eth0 src port not 22ainst one the mentioned conditions in the command, like
-
- **$ tcpdump src 192.168.1.100 or dst 192.168.1.50 && port 22 -w ssh_packets**
-
- **$ tcpdump port 443 or 80 -w http_packets**
-
-**Using EXCEPT**
-
-EXCEPT will be used when we want not fulfill a condition, like
-
- **$ tcpdump -i eth0 src port not 22**
-
-This will monitor all the traffic on eth0 but will not capture port 22.
-
-This was our tutorial on how to install & use tcpdump command to capture the network packets. Please feel free to send in any queries or suggestions using the comment box below.
-
---------------------------------------------------------------------------------
-
-via: http://linuxtechlab.com/learn-use-tcpdump-command-examples/
-
-作者：[Shusain ][a]
-译者：[lujun9972](https://github.com/lujun9972)
-校对：[校对者ID](https://github.com/校对者ID)
-
-本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
-
-[a]:http://linuxtechlab.com/author/shsuain/
-[1]:http://linuxtechlab.com/monitoring-network-bandwidth-iftop-command/
diff --git a/translated/tech/20171109 Learn how to use tcpdump command with examples.md b/translated/tech/20171109 Learn how to use tcpdump command with examples.md
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+通过案例学习 TCPDUMP 命令
+======
+Tcpdump 是一个很常用的网络包分析工具，可以用来显示通过网络传输到本系统的 TCP\IP 以及其他网络的数据包。Tcpdump 使用 libpcap 库来抓取网络报，这个库在几乎存在于所有的 Linux/Unix 中。
+
+Tcpdump 可以从网卡或之前创建的数据包文件中读取内容，也可以将包写入文件中以供后续使用。必须是 root 用户或者使用 sudo 特权来运行 tcpdump。
+
+在本文中，我们将会通过一些案例来演示如何使用 tcpdump 命令，但首先让我们来看看在各种 Linux 操作系统中是如何安装 tcpdump 的。
+
+ **(推荐阅读：[使用 iftop 命令监控网络带宽 ][1])**
+
+### 安装
+
+tcpdump 默认在几乎所有的 Linux 发行版中都可用，但若你的 Linux 上没有的话，使用下面方法进行安装。
+
+#### CentOS/RHEL
+
+使用下面命令在 CentOS 和 RHEL 上安装 tcpdump，
+
+```
+$ sudo yum install tcpdump*
+```
+
+#### Fedora
+
+使用下面命令在 Fedora 上安装 tcpdump，
+
+```
+$ dnf install tcpdump
+```
+
+#### Ubuntu/Debian/Linux Mint
+
+在 Ubuntu/Debain/Linux Mint 上使用下面命令安装 tcpdump
+
+```
+$ apt-get install tcpdump
+```
+
+安装好 tcpdump 后，现在来看一些例子。
+
+### 案例演示
+
+#### 从所有网卡中捕获数据包
+
+运行下面命令来从所有网卡中捕获数据包，run the following command，
+
+```
+$ tcpdump -i any
+```
+
+#### 从指定网卡中捕获数据包
+
+要从指定网卡中捕获数据包，运行
+
+```
+$ tcpdump -i eth0
+```
+
+#### 将捕获的包写入文件
+
+使用 ‘-w’ 选项将所有捕获的包写入文件，
+
+```
+$ tcpdump -i eth1 -w packets_file
+```
+
+#### 读取之前产生的 tcpdump 文件
+
+使用下面命令从之前创建的 tcpdump 文件中读取内容
+
+```
+$ tcpdump -r packets_file
+```
+
+#### 获取更多的包信息并且以可读的形式显示时间戳
+
+要获取更多的包信息同时以可读的形式显示时间戳，使用
+
+```
+$ tcpdump -ttttnnvvS
+```
+
+#### 查看整个网络的数据包
+
+要获取整个网络的数据包，在终端执行下面命令
+
+```
+$ tcpdump net 192.168.1.0/24
+```
+
+#### 根据 IP 地址查看报文
+
+要获取指定 IP 的数据包，不管是作为源地址还是目的地址，使用下面命令，
+
+```
+$ tcpdump host 192.168.1.100
+```
+
+要指定 IP 地址是源地址或是目的地址则使用
+
+```
+$ tcpdump src 192.168.1.100
+$ tcpdump dst 192.168.1.100
+```
+
+#### 查看某个协议或端口号的数据包
+
+要查看某个协议的数据包，运行下面命令
+
+```
+$ tcpdump ssh
+```
+
+要捕获某个端口或一个范围的数据包，使用
+
+```
+$ tcpdump port 22
+$ tcpdump portrange 22-125
+```
+
+我们也可以与 'src' 和 'dst' 选项连用来捕获指定源端口或指定目的端口的报文
+
+我们还可以使用 AND (与，&& )，OR ( 或。|| ) & EXCEPT (非，！) 来将两个条件组合起来。当我们需要基于某些条件来分析网络报文是非常有用。
+
+#### 使用 AND
+
+可以使用 'and' 或者符号 '&&' 来将两个或多个条件组合起来。比如，
+
+```
+$ tcpdump src 192.168.1.100 && port 22 -w ssh_packets
+```
+
+#### 使用 OR
+
+OR 会检查是否匹配命令所列条件中的其中一条，像这样
+
+```
+$ tcpdump src 192.168.1.100 or dst 192.168.1.50 && port 22 -w ssh_packets
+$ tcpdump port 443 or 80 -w http_packets
+```
+
+#### 使用 EXCEPT
+
+当我们想表达不匹配某项条件时可以使用 EXCEPT，像这样
+
+```
+$ tcpdump -i eth0 src port not 22
+```
+
+这会捕获 eth0 上除了 22 号端口的所有通讯。
+
+我们的教程至此就结束了，在本教程中我们讲解了如何安装并使用 tcpdump 来捕获网络数据包。如有任何疑问或建议，欢迎留言。
+
+--------------------------------------------------------------------------------
+
+via: http://linuxtechlab.com/learn-use-tcpdump-command-examples/
+
+作者：[Shusain ][a]
+译者：[lujun9972](https://github.com/lujun9972)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]:http://linuxtechlab.com/author/shsuain/
+[1]:http://linuxtechlab.com/monitoring-network-bandwidth-iftop-command/