May 23, 2021 That's what Linux should learn
Keeping your data secure is one of the most important jobs after ensuring the availability of your data. F irewall, as a protective barrier between the public network and the intranet, plays an important role in ensuring the security of data. Considering that you do not yet understand the difference between the new Firewalld firewall in RHEL 7 and the iptables firewall in previous versions, Mr. Liu decided to lead the reader to correctly understand the relationship between the two firewalls from both a theoretical and a practical level.
This chapter will use firewall policy configuration services such as iptables, firewall-cmd, firewall-config, and TCP Wrappers to complete dozens of firewall policy configuration experiments designed to meet real-world work needs. After learning these experiments, readers can not only skillfully filter the requested traffic, but also allow and deny traffic based on the name of the service program, ensuring the security of the Linux system.