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啊……翘儿一声疾呼，双腿发软。Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.突然，比天空耀眼的光芒倾泻。To read the original text, please click on the following link: http://www.cert.org.cn/publish/main/upload/File/DDoS201806.pdf赵文华也有憋闷的地方，任倭寇从立春劫掠到谷雨。Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia　　而商海棠的初恋情人马静安更遭遇了家破人亡的惨痛，在恋人和亲人相继离去的双重打击之下，他落草为寇，靠着过人的智慧和毒辣，成为独霸一方的匪首，一心不择手段想搞垮鲍家，使商海棠重回自己怀抱……