怎么在Linux服务器上测试TCP/UDP端口的连通性?

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 <hostname/IP address> <port number>

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 <hostname/IP address> <port number>

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 <hostname/IP address> <port number>
# nc -z -v -u 192.118.20.95 123
Connection to 192.118.20.95 123 port [udp/ntp] succeeded!

How to Test Port [TCP/UDP] Connectivity from a Linux Server 怎么在Linux服务器上测试TCP/UDP端口的连通性?

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