Linux服务器上测试TCP/UDP端口的连通性

Posted 2022-08-08 xiangjai

目录

说明

测试tcp端口的连通性：

使用nc命令来测试udp端口的连通性：

使用nc命令来测试tcp端口的连通性：

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说明

翻译自：
How to Test Port[TCP/UDP] Connectivity from a Linux Server (文档 ID 2212626.1)
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：

[root@centos7-kh62 ~]# telnet 10.100.1.29 22
Trying 10.100.1.29...
Connected to 10.100.1.29.
Escape character is '^]'.
SSH-2.0-OpenSSH_8.1

Invalid SSH identification string.
Connection closed by foreign host.

如下是连通不成功的例子：

[root@centos7-kh62 ~]# telnet 10.100.1.29 23
Trying 10.100.1.29...
telnet: connect to address 10.100.1.29: Connection refused

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>

如下是连接成功的例子

[root@centos7-kh62 ~]# nc -z -v -u 10.100.1.29 1540
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to 10.100.1.29:1540.
Ncat: UDP packet sent successfully
Ncat: 1 bytes sent, 0 bytes received in 2.02 seconds.

如下是连接不成功的例子

[root@centos7-kh62 ~]# nc -z -v -u 10.100.1.29 111
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to 10.100.1.29:111.
Ncat: Connection refused.

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>

如下是连接成功的例子

[root@centos7-kh62 ~]# nc -z -v 10.100.1.29 22
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to 10.100.1.29:22.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.

参考： https://blog.csdn.net/msdnchina/article/details/54783382#