From 25eae5f9255f2fb7f4247f8c581c127f76af1071 Mon Sep 17 00:00:00 2001 From: geekpi Date: Tue, 7 Feb 2017 09:38:36 +0800 Subject: [PATCH 1/2] translating --- ... How to Check Remote Ports are Reachable Using nc Command.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sources/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md b/sources/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md index 57572c3ed7..b166d79341 100644 --- a/sources/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md +++ b/sources/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md @@ -1,3 +1,5 @@ +translating---geekpi + How to Check Remote Ports are Reachable Using ‘nc’ Command ============================================================ From df48b23f9dfb81c47383e17559df9e276cd62d7d Mon Sep 17 00:00:00 2001 From: geekpi Date: Tue, 7 Feb 2017 10:10:18 +0800 Subject: [PATCH 2/2] translated --- ...te Ports are Reachable Using nc Command.md | 71 ------------------ ...te Ports are Reachable Using nc Command.md | 72 +++++++++++++++++++ 2 files changed, 72 insertions(+), 71 deletions(-) delete mode 100644 sources/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md create mode 100644 translated/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md diff --git a/sources/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md b/sources/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md deleted file mode 100644 index b166d79341..0000000000 --- a/sources/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md +++ /dev/null @@ -1,71 +0,0 @@ -translating---geekpi - -How to Check Remote Ports are Reachable Using ‘nc’ Command -============================================================ - -A port is a logical entity which acts as a endpoint of communication associated with an application or process on an Linux operating system. It is useful to know which ports are open and running services on a target machine before using them. - -We can easily [list open ports in Linux][3] on a local machine using the [netstat][4] or several other Linux commands such [NMAP][5]. - -In this guide, we will show you how to determine if ports on a remote host are reachable/open using simple netcat (in short nc) command. - -netcat (or nc in short) is a powerful and easy-to-use utility that can be employed for just about anything in Linux in relation to TCP, UDP, or UNIX-domain sockets. - -``` -# yum install nc [On CentOS/RHEL] -# dnf install nc [On Fedora 22+] -$ sudo apt-get install netcat [On Debian/Ubuntu] -``` - -We can use it to: open TCP connections, listen on arbitrary TCP and UDP ports, send UDP packets, do port scanning under both IPv4 and IPv6 and beyond. - -Using netcat, you can check if a single or multiple or a range of open ports as follows. The command below will help us see if the port 22 is open on the host 192.168.56.10: - -``` -$ nc -zv 192.168.1.15 22 -``` - -In the command above, the flag: - -1. `-z` – sets nc to simply scan for listening daemons, without actually sending any data to them. -2. `-v` – enables verbose mode. - -The next command will check if ports 80, 22 and 21 are open on the remote host 192.168.5.10 (we can use the hostname as well): -nc -zv 192.168.56.10 80 22 21 - -It is also possible to specify a range of ports to be scanned:’ - -``` -$ nc -zv 192.168.56.10 20-80 -``` - -For more examples and usage of netcat command, read through our articles as follows. - -1. [Transfer Files Between Linux Servers Using netcat Command][1] -2. [Linux Network Configuration and Troubleshooting Commands][2] - -That’s all. In this article, we explained how to check if ports on a remote host are reachable/open using simple netcat commands. Make use of the comment section below to write back to us concerning about this tip. - --------------------------------------------------------------------------------- - -译者简介： - -Aaron Kili is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge. - --------------------------------------------------------------------------------- - -via: http://www.tecmint.com/check-remote-port-in-linux/ - -作者：[Aaron Kili][a] -译者：[译者ID](https://github.com/译者ID) -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://www.tecmint.com/author/aaronkili/ - -[1]:http://www.tecmint.com/transfer-files-between-two-linux-machines/ -[2]:http://www.tecmint.com/linux-network-configuration-and-troubleshooting-commands/ -[3]:http://www.tecmint.com/find-open-ports-in-linux/ -[4]:http://www.tecmint.com/20-netstat-commands-for-linux-network-management/ -[5]:http://www.tecmint.com/nmap-command-examples/ diff --git a/translated/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md b/translated/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md new file mode 100644 index 0000000000..0b9590250f --- /dev/null +++ b/translated/tech/20170206 How to Check Remote Ports are Reachable Using nc Command.md @@ -0,0 +1,72 @@ +使用 “nc” 命令检查远程端口是否打开 +============================================================ + +端口是作为与 Linux 操作系统上的应用或进程相关联的端点的逻辑实体。在使用之前，了解目标机器上哪些端口是打开的并正在运行服务是非常有用的。 + +我们可以使用 [netstat][4] 或其他几个 Linux 命令如 [NMAP][5] 在本地机器上轻松地[列出 Linux 中的打开端口][3]。 + +在本指南中，我们将向你展示如何使用简单的 netcat（简称 nc）命令来确定远程主机上的端口是否可访问/打开。 + +netcat（或简称 nc）是一个功能强大且易于使用的程序，可用于 Linux 中与 TCP、UDP 或 UNIX 域套接字相关的任何事情。 + +``` +# yum install nc [在 CentOS/RHEL 中] +# dnf install nc [在 Fedora 22+ 中] +$ sudo apt-get install netcat [在 Debian/Ubuntu 中] +``` + +我们可以使用它：打开 TCP 连接、侦听任意 TCP 和 UDP 端口、发送 UDP 数据包、在 IPv4 和 IPv6 进行端口扫描。 + +使用 netcat，你可以检查单个或多个或一系列打开的端口，如下所示。下面的命令将帮助我们查看端口 22 是否在主机 192.168.56.10 上打开： + +``` +$ nc -zv 192.168.1.15 22 +``` + +上面的命令中，这些标志是： + +1. `-z` – 设置 nc 只是扫描侦听守护进程，实际上不向它们发送任何数据。 +2. `-v` – 启用 verbose 模式 + +下面的命令会在远程主机 192.168.5.10 上端口 80、22 和 21 是否打开（我们也可以使用主机名）： + +``` +nc -zv 192.168.56.10 80 22 21 +``` + +也可以指定端口扫描的范围： + +``` +$ nc -zv 192.168.56.10 20-80 +``` + +更多关于 netcat 命令的例子和使用，阅读我们下面的文章。 + +1. [使用 netcat 命令在 Linux 服务器键传输文件][1] +2. [Linux 网络配置及除错命令][2] + +就是这样。在本文中，我们解释了如何使用 netcat 命令检测远程主机端口是否可达/打开。在评论栏中留下你的想法。 + +-------------------------------------------------------------------------------- + +译者简介： + +Aaron Kili 是 Linux 和 F.O.S.S 爱好者，将来的 Linux SysAdmin 和 web 开发人员，目前是 TecMint 的内容创建者，他喜欢用电脑工作，并坚信分享知识。 + +-------------------------------------------------------------------------------- + +via: http://www.tecmint.com/check-remote-port-in-linux/ + +作者：[Aaron Kili][a] +译者：[geekpi](https://github.com/geekpi) +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://www.tecmint.com/author/aaronkili/ + +[1]:http://www.tecmint.com/transfer-files-between-two-linux-machines/ +[2]:http://www.tecmint.com/linux-network-configuration-and-troubleshooting-commands/ +[3]:http://www.tecmint.com/find-open-ports-in-linux/ +[4]:http://www.tecmint.com/20-netstat-commands-for-linux-network-management/ +[5]:http://www.tecmint.com/nmap-command-examples/