Linux下检测某个ip端口的连通状态

举个例子，要测试的 ip+port: 192.168.0.100:8080

1. 使用 telnet 命令

   telnet 192.168.0.100 8080

   连通成功：

   Trying 192.168.0.100...
   Connected to 192.168.0.100.
   Escape character is '^]'.
   Connection closed by foreign host.

   连通失败：

   rying 192.168.0.100...
   telnet: Unable to connect to remote host: Connection refused

2. 使用 nc 命令

   nc -zvw3 192.168.0.100 8080

   参数说明：

   1. -z: 仅扫描侦听， 不会发送数据。
   2. -v: 输出详细信息。
   3. -w3: 允许超时3秒~

   连通成功：

   Connection to 192.168.0.100 8080 port [tcp/http] succeeded!

   连通失败：

   nc: connect to 192.168.0.100 port 8080 (tcp) failed: Connection refused

3. 使用 nmap 命令

   nmap 192.168.0.100 -p 8080

   连通成功：

   Starting Nmap 7.80 ( https://nmap.org ) at 2021-01-21 21:30 CST
   Nmap scan report for 192.168.0.100
   Host is up (0.00049s latency).
   
   PORT     STATE SERVICE
   8080/tcp open  http
   
   Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds

   连通失败：

   Starting Nmap 7.80 ( https://nmap.org ) at 2021-01-21 21:30 CST
   Nmap scan report for 192.168.0.100
   Host is up (0.00029s latency).
   
   PORT     STATE  SERVICE
   8080/tcp closed unknown
   
   Nmap done: 1 IP address (1 host up) scanned in 0.06 seconds

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