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Appendix B他平生所闯过的龙潭虎穴也不知有多少，他平生所遇的凶险疑难之事何止千百，但是还没有哪一次像现在这样毫无把握。The review process is also a process of thinking reconstruction for reviewers to help more people understand the system.If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.偏墨鲫跟香荽好，即便知道她是说笑，也忍不住跟她保证道：香荽不怕。老妇摇头道：汪滶平庸，亡夫只求其一生平安。However, in the actual use process, Rules are often defined through "tables" as operators. The reason why iptables are introduced according to the above process is that it is easier to understand them from the perspective of "checkpoints" and from the perspective of entry. However, in order to understand them more smoothly in actual use, we also list the relationship between each "table" and "chain" here.