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
使用
telnet命令telnet 192.168.0.100 8080连通成功：
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4Trying 192.168.0.100...
Connected to 192.168.0.100.
Escape character is '^]'.
Connection closed by foreign host.连通失败：
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2rying 192.168.0.100...
telnet: Unable to connect to remote host: Connection refused使用
nc命令nc -zvw3 192.168.0.100 8080参数说明：
-z: 仅扫描侦听， 不会发送数据。-v: 输出详细信息。-w3: 允许超时3秒~连通成功：
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Connection to 192.168.0.100 8080 port [tcp/http] succeeded!
连通失败：
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nc: connect to 192.168.0.100 port 8080 (tcp) failed: Connection refused
使用
nmap命令nmap 192.168.0.100 -p 8080连通成功：
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8Starting 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：
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8Starting 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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