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Neurosis tendency is assessed individually.一见面，韩信没有别的，先向尹旭道歉。4. Ships engaged in dredging or underwater operations shall display the lights and types specified in subparagraphs (1), (2) and (3) of paragraph 2 of this Article when their maneuvering capability is limited. In addition, when there is an obstacle, it should also be displayed:匈奴的主力雁门和代郡，越国则来了一招声东击西，将主力全部投入到了河朔。1We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.