参考文章:https://blog.csdn.net/dhRainer/article/details/84846417如果按照tcp/ip来划分连接状态，有11种之多(https://ww ***

https://www.niaoyun.com/docs/16748.html启动FirewallD服务：systemctl enable firewalld.service #设置开机启动 ***

后门程序的特点及经典案例介绍https://product.pconline.com.cn/itbk/software/dnyw/1707/9626667.html后门程序--百度百科htt ***

http://www.voycn.com/article/centos8-peizhialiyuan-zuixiaohuaanzhuang

https://www.bilibili.com/video/av55547729/?p=18

https://www.bilibili.com/video/av48186405/?p=4

http://blog.sina.com.cn/s/blog_4c86552f0102wkbc.html

https://www.bilibili.com/video/av68562526/?p=4

https://www.cnblogs.com/whych/p/9147900.html

ettercap局域网内DNS欺骗https://blog.csdn.net/aozhuo4755/article/details/101107875https://www.freebuf. ***