Link tham khảo :

  • https://hostpresto.com/community/tutorials/how-to-install-and-configure-squid-proxy-on-centos-7/
  • https://www.rootusers.com/how-to-use-firewalld-rich-rules-and-zones-for-filtering-and-nat/
  • http://svuit.vn/#firewall-ids-ips-waf-77