1、nc -z -w 5 www.163.com 110 && echo ok || echo error 2、tcptraceroute www.163.com 110 3、telnet www.1
1、nc -z -w 5 www.163.com 110 && echo ok || echo error
2、tcptraceroute www.163.com 110
3、telnet www.163.com 110
4、nc -z -w 5 -u 223.5.5.5 53 && echo ok || echo error
