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：
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：
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欢迎访问 spaceack.com
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原始发表：2021-01-21，如有侵权请联系 cloudcommunity@tencent.com 删除
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