# yum -y install nc
# yum info nmap-ncat
# nc --help




nc测试UDP是否正常
https://www.cnblogs.com/moniter/p/12305133.html
一文让你熟练掌握Linux的ncat(nc)命令
https://www.cnblogs.com/ECJTUACM-873284962/p/9712882.html
Linux网络命令必知必会之瑞士军刀 nc(netcat)
https://www.cnblogs.com/bakari/p/10898604.html
nc命令用法举例
https://www.cnblogs.com/nmap/p/6148306.html
nc工具测试tcp/udp协议
https://blog.csdn.net/feinifi/article/details/105788322
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