From 3b0362d7042c4b18b7459f72afb5b7897c1fa331 Mon Sep 17 00:00:00 2001 From: zhengsihua Date: Thu, 15 Jan 2015 10:07:42 +0800 Subject: [PATCH] translated --- ...entOS or RHEL or Scientific Linux 6 & 7.md | 160 ------------------ ...entOS or RHEL or Scientific Linux 6 & 7.md | 159 +++++++++++++++++ 2 files changed, 159 insertions(+), 160 deletions(-) delete mode 100644 sources/tech/20150114 Installing Telnet In CentOS or RHEL or Scientific Linux 6 & 7.md create mode 100644 translated/tech/20150114 Installing Telnet In CentOS or RHEL or Scientific Linux 6 & 7.md diff --git a/sources/tech/20150114 Installing Telnet In CentOS or RHEL or Scientific Linux 6 & 7.md b/sources/tech/20150114 Installing Telnet In CentOS or RHEL or Scientific Linux 6 & 7.md deleted file mode 100644 index 42c481f232..0000000000 --- a/sources/tech/20150114 Installing Telnet In CentOS or RHEL or Scientific Linux 6 & 7.md +++ /dev/null @@ -1,160 +0,0 @@ -Translating-----geekpi - -Installing Telnet In CentOS/RHEL/Scientific Linux 6 & 7 -================================================================================ -#### Disclaimer: #### - -Before installing and using Telnet, keep the following in mind. - -- Using Telnet in public network(WAN) is very very bad idea. It transmits login data in the clear format. Everything will be sent in plain text. -- If you still need Telnet, It is highly recommended use it in the local area network only. -- Alternatively, you can use **SSH**. But make sure you’ve disabled root login in SSH. - -### What Is Telnet? ### - -[Telnet][1] is a network protocol which is used to connect to remote computers over TCP/IP network. Once you establish a connection to the remote computer, it becomes a virtual terminal and will allow you to communicate with the remote host from your local system. - -In this brief tutorial, let us see how to install Telnet, and how to access remote systems via Telnet. - -### Installation ### - -Open your terminal and type the following command to install telnet: - - yum install telnet telnet-server -y - -Now, the telnet has been installed in your server. Next, edit the telnet configuration file **/etc/xinetd.d/telnet**; - - vi /etc/xinetd.d/telnet - -Set **disable = no**: - - # default: on - # description: The telnet server serves telnet sessions; it uses \ - # unencrypted username/password pairs for authentication. - service telnet - { - flags = REUSE - socket_type = stream - wait = no - user = root - server = /usr/sbin/in.telnetd - log_on_failure += USERID - disable = no - } - -Save and quit the file. Be mindful that you don’t have do this step in CentOS 7. - -Now restart the telnet service using the following command: - -On CentOS 6.x systems: - - service xinetd start - -Make this service to start automatically on every reboot: - -On CentOS 6: - - chkconfig telnet on - chkconfig xinetd on - -On CentOS 7: - - systemctl start telnet.socket - systemctl enable telnet.socket - -Allow the telnet default port **23** through your firewall and Router. To allow the telnet port through firewall, Edit file **/etc/sysconfig/iptables** on CentOS 6.x systems: - - vi /etc/sysconfig/iptables - -Add the line as shown in red color: - - # Firewall configuration written by system-config-firewall - # Manual customization of this file is not recommended. - *filter - :INPUT ACCEPT [0:0] - :FORWARD ACCEPT [0:0] - :OUTPUT ACCEPT [0:0] - -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT - -A INPUT -p icmp -j ACCEPT - -A INPUT -i lo -j ACCEPT - -A INPUT -p tcp -m state --state NEW --dport 23 -j ACCEPT - -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT - -A INPUT -j REJECT --reject-with icmp-host-prohibited - -A FORWARD -j REJECT --reject-with icmp-host-prohibited - COMMIT - -Save and exit the file. Restart iptables service: - - service iptables restart - -On CentOS 7, run the following commands to enable telnet service through firewall. - - firewall-cmd --permanent --add-port=23/tcp - firewall-cmd --reload - -Thats it. Now telnet server is ready to use. - -#### Creating users #### - -Create a test user, for example “**sk**” with password “**centos**“: - - useradd sk - passwd sk - -#### Client Side Configuration #### - -Install telnet package: - - yum install telnet - -On DEB based systems: - - sudo apt-get install telnet - -Now, open Terminal, and try to access your server(remote host). - -If your client is Linux system, open the terminal and type the following command to connect to telnet server. - - telnet 192.168.1.150 - -Enter username and password which we have created in the server: - -Sample output: - - Trying 192.168.1.150... - Connected to 192.168.1.150. - Escape character is '^]'. - - Kernel 3.10.0-123.13.2.el7.x86_64 on an x86_64 - server1 login: sk - Password: - [sk@server1 ~]$ - -As you see in the above output, the remote system has been successfully accessed from the local machine. - -If your client is windows system, then go to **Start -> Run -> Command Prompt**. - -In the command prompt, type the command: - - telnet 192.168.1.150 - -Where **192.168.1.150** is remote host IP address. - -Now you will be able to connect to your server. - -That’s it. - -Cheers! - --------------------------------------------------------------------------------- - -via: http://www.unixmen.com/installing-telnet-centosrhelscientific-linux-6-7/ - -作者：[SK][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) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出 - -[a]:http://www.unixmen.com/author/sk/ -[1]:http://en.wikipedia.org/wiki/Telnet \ No newline at end of file diff --git a/translated/tech/20150114 Installing Telnet In CentOS or RHEL or Scientific Linux 6 & 7.md b/translated/tech/20150114 Installing Telnet In CentOS or RHEL or Scientific Linux 6 & 7.md new file mode 100644 index 0000000000..901ce4380f --- /dev/null +++ b/translated/tech/20150114 Installing Telnet In CentOS or RHEL or Scientific Linux 6 & 7.md @@ -0,0 +1,159 @@ +在CentOS/RHEL/Scientific Linux 6 & 7 上安装Telnet +================================================================================ + +#### 声明： #### + +在安装和使用Telnet之前，需要记住以下几点。 + +- 在公网(WAN)中使用Telnet是非常不好的想法。它会以明文的格式传输登入数据。每个人都可以看到明文。 +- 如果你还是需要Telnet，强烈建议你只在局域网内部使用。 +- 你可以使用**SSH**作为替代方法。但是确保不要用root用户登录。 + +### Telnet是什么？ ### + +[Telnet][1] 是用于通过TCP/IP网络远程登录计算机的协议。一旦与远程计算机建立了连接，它就会成为一个虚拟终端且允许你与远程计算机通信。 + +在本篇教程中，我们会展示如何安装Telnet并且如何通过Telnet访问远程系统。 + +### 安装 ### + +打开终端并输入下面的命令来安装telnet： + + yum install telnet telnet-server -y + +现在telnet已经安装在你的服务器上了。接下来编辑文件**/etc/xinetd.d/telnet**： + + vi /etc/xinetd.d/telnet + +设置 **disable = no**: + + # default: on + # description: The telnet server serves telnet sessions; it uses \ + # unencrypted username/password pairs for authentication. + service telnet + { + flags = REUSE + socket_type = stream + wait = no + user = root + server = /usr/sbin/in.telnetd + log_on_failure += USERID + disable = no + } + +保存并退出文件。记住我们不必在CentOS 7做这步。 + +接下来使用下面的命令重启telnet服务： + +在CentOS 6.x 系统中： + + service xinetd start + +让这个服务在每次重启时都会启动： + +在CentOS 6上： + + chkconfig telnet on + chkconfig xinetd on + +在CentOS 7上： + + systemctl start telnet.socket + systemctl enable telnet.socket + +让telnet的默认端口**23**可以通过防火墙和路由器。要让telnet端口可以通过防火墙，在CentOS 6.x系统中编辑下面的文件： + + vi /etc/sysconfig/iptables + +加入红色显示的行： + + # Firewall configuration written by system-config-firewall + # Manual customization of this file is not recommended. + *filter + :INPUT ACCEPT [0:0] + :FORWARD ACCEPT [0:0] + :OUTPUT ACCEPT [0:0] + -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT + -A INPUT -p icmp -j ACCEPT + -A INPUT -i lo -j ACCEPT + -A INPUT -p tcp -m state --state NEW --dport 23 -j ACCEPT + -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT + -A INPUT -j REJECT --reject-with icmp-host-prohibited + -A FORWARD -j REJECT --reject-with icmp-host-prohibited + COMMIT + +保存并退出文件。重启iptables服务： + + service iptables restart + +在CentOS 7中，运行下面的命令让telnet服务可以通过防火墙。 + + firewall-cmd --permanent --add-port=23/tcp + firewall-cmd --reload + +就是这样。现在telnet服务就可以使用了。 + +#### 创建用户 #### + +创建一个测试用户，比如用户名是“**sk**”，密码是“**centos**“: + + useradd sk + passwd sk + +#### 客户端配置 #### + +安装telnet包： + + yum install telnet + +在基于DEB的系统中： + + sudo apt-get install telnet + +现在，打开终端，尝试访问你的服务器（远程主机）。 + +如果你的客户端是Linux系统，打开终端并输入下面的命令来连接到telnet服务器上。 + + telnet 192.168.1.150 + +输入服务器上已经创建的用户名和密码： + +示例输出: + + Trying 192.168.1.150... + Connected to 192.168.1.150. + Escape character is '^]'. + + Kernel 3.10.0-123.13.2.el7.x86_64 on an x86_64 + server1 login: sk + Password: + [sk@server1 ~]$ + +如你所见，已经成功从本地访问远程主机了。 + +如果你的系统是windows，进入**开始 -> 运行 -> 命令提示符**。 + +在命令提示符中，输入命令： + + telnet 192.168.1.150 + +**192.168.1.150**是远程主机IP地址。 + +现在你就可以连接到你的服务器上了。 + +就是这样。 + +干杯！ + +-------------------------------------------------------------------------------- + +via: http://www.unixmen.com/installing-telnet-centosrhelscientific-linux-6-7/ + +作者：[SK][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) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出 + +[a]:http://www.unixmen.com/author/sk/ +[1]:http://en.wikipedia.org/wiki/Telnet \ No newline at end of file