ping, telnet, tcping 命令使用及对比https://blog.csdn.net/kikajack/article/details/79917851?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-3.vipsorttest&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-3.vipsorttest