如何查看巴西vps主機是否開啟25端口，因為一般國內客戶用國外的vps基本上做外貿商城的多，做商城就要用到25端口，先登錄ssh，然后輸入命令：telnet -b 本機IP mx3.qq.com 25，有時候會出現-bash: telnet: command not found
提示-bash: telnet: command not found的解決方法
Linux centos 運行telnet命令，出現下面的錯誤提示：
[root@localhost ~]# telnet 127.0.0.1
-bash: telnet: command not found
解決方法: 安裝telnet服務
centos、ubuntu安裝telnet命令的方法.
yum list telnet* 列出telnet相關的安裝包
yum install telnet-server 安裝telnet服務
yum install telnet* 安裝telnet客戶端
[root@localhost ~]# yum list telnet*
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirrors.cn99.com
* extras: mirrors.shu.edu.cn
* updates: mirrors.cn99.com
Available Packages
telnet.x86_64 1:0.17-48.el6 base
telnet-server.x86_64 1:0.17-48.el6 base
[root@localhost ~]# yum install telnet-server
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirrors.cn99.com
* extras: mirrors.shu.edu.cn
* updates: mirrors.cn99.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package telnet-server.x86_64 1:0.17-48.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
telnet-server x86_64 1:0.17-48.el6 base 37 k
Transaction Summary
================================================================================
Install 1 Package(s)
Total download size: 37 k
Installed size: 54 k
Is this ok [y/N]: y
Downloading Packages:
telnet-server-0.17-48.el6.x86_64.rpm | 37 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
Installing : 1:telnet-server-0.17-48.el6.x86_64 1/1
Verifying : 1:telnet-server-0.17-48.el6.x86_64 1/1
Installed:
telnet-server.x86_64 1:0.17-48.el6
Complete!
[root@localhost ~]#
[root@localhost ~]# yum install telnet.*
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirrors.cn99.com
* extras: mirrors.shu.edu.cn
* updates: mirrors.cn99.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package telnet.x86_64 1:0.17-48.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
====================================================================================================================================
Package Arch Version Repository Size
====================================================================================================================================
Installing:
telnet x86_64 1:0.17-48.el6 base 58 k
Transaction Summary
====================================================================================================================================
Install 1 Package(s)
Total download size: 58 k
Installed size: 109 k
Is this ok [y/N]: y
Downloading Packages:
telnet-0.17-48.el6.x86_64.rpm | 58 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : 1:telnet-0.17-48.el6.x86_64 1/1
Verifying : 1:telnet-0.17-48.el6.x86_64 1/1
Installed:
telnet.x86_64 1:0.17-48.el6
Complete!
[root@localhost ~]#
