怎么在Linux服务器上测试TCP/UDP端口的连通性?

作者: msdnchina 2017-01-31 10:58:02

适用于:


Linux OS - Version Oracle Linux 5.0 to Oracle Linux 6.8 [Release OL5 to OL6U8]


Information in this document applies to any platform.


 


目标:


在Linux服务器上检查TCP/UDP端口的连通性。


 


解决方案:


telnet和nc 是用来测试端口连通性的一般工具。


telnet可以测试tcp端口的连通性。


nc可以测试tcp和udp端口的连通性。


请确保telnet和nc工具已经安装


# yum install nc  


# yum install telnet  


测试tcp端口的连通性:


语法如下:


telnet  


如下是连通成功的例子:


# telnet 192.118.20.95 22  


Trying 192.118.20.95...  


Connected to 192.118.20.95.  


Escape character is '^]'.  


SSH-2.0-OpenSSH_6.6.1


Protocol mismatch.  


Connection closed by foreign host.


如下是连通不成功的例子:


# telnet 192.118.20.95 22  


Trying 192.118.20.95...  


telnet: connect to address 192.118.20.95: No route to host


使用nc命令来测试tcp端口的连通性:


语法:


nc -z -v


如下是连通成功的例子:


# nc -z -v 192.118.20.95 22  


Connection to 192.118.20.95 22 port [tcp/ssh] succeeded!


如下是连通不成功的例子:


# nc -z -v 192.118.20.95 22  


nc: connect to 192.118.20.95 port 22 (tcp) failed: No route to host


使用nc命令来测试udp端口的连通性:


语法:


nc -z -v -u


# nc -z -v -u 192.118.20.95 123  


Connection to 192.118.20.95 123 port [udp/ntp] succeeded!


 


本文永久更新地址:http://www.linuxdiyf.com/linux/28075.html

相关资讯