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At this point, DDoS Attack and Defense: The first part of the introduction from principle to practice is completed. Welcome to offer more insights.When we write Iptables rules, we should always keep this routing order diagram in mind and flexibly configure the rules.Thanks to Tengxunyun's friends, they provided a high-security IP, which enabled the website to go online again. Now, my protection is that there is a CDN in front of the source server. If the domain name is attacked, CDN can block it. If I directly attack the source server, I bought a flexible IP, which can dynamically mount the host instance and change the address when attacked. This is just a technical blog, the content is free, to prevent this point, I am speechless.In addition to M movement, there is also a method of fast movement: select the block to be moved, click the left mouse button, drag to the required position and release it, so as to achieve the purpose of fast movement. This method is much more convenient for movements that do not require precise positions.