Learned the powerful network management functions of Linux

I learned about the powerful network management function of Linux-Linux Enterprise Application-Linux server application. The following is a detailed description. After nearly a month, I initially learned how to use the powerful network management function of linux. In this month, I learned how to query data on the Internet. I gradually learned to read the man page document and learn how to use and improve it based on the existing iptables rules. For example, you have learned how to use English documents to learn and use new commands. What impressed me the most is. Block out the specified IP segment iptables-t tablename-m iprange -- src-range XX-XX-d destination-j option and some actions related to limiting IP and MAC. For example, iptables-t tablename-s source-ip/mask-d dest-ip/mask-p option-j option OR iptables-t tablename-m mac -- mac-source XX: XX: XX-d des-ip/mask-p option-j option and other methods. The problem is that some commands and methods related to traffic control and modifying headers in the table mangle have not yet been learned. At the beginning, I wanted to buy a book about linux. However, I went to the library several times and read several books to find that I only needed a small part of theoretical knowledge and command-related explanations in those books. However, I have learned a lot about theoretical knowledge when I took an intermediate title. It is also found that there are still practical problems for specific operations that can actually be done, and those theories alone cannot be used in practical problems at all. In my opinion, the most practical and powerful and stable network operating system and network management system are not well-known equipment and some specialized software tools. Consider the flexibility of functions, the financial resources invested by hardware, and the flexibility of future maintenance based on the conditions and environment required for daily office work. Using several PCs and simple network switches is enough to complete all the functions that valuable Cisco and other switches can accomplish. Although the hardware execution efficiency is much higher than that of software, with the advancement and development of modern software technology and hardware, in terms of network load, Server Load balancer technology can be used to distribute the processing tasks of the central node to NICs of different hosts, the software processing work on the node computer on it can be completely handed over to linux. In addition, you only need to implement the routing function and the corresponding firewall policy. Other related components can be completely uninstalled. Of course, it's just because no other functions are needed. This requires "adapting to local conditions '.