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The biggest cost of the network cable is the conductor inside the network cable, which is also the main transmission conductor! The materials are all copper, copper-clad silver, four iron and four aluminum! Then there are PVC materials and wire boxes, so the price fluctuation of metal, PVC and paper directly affects the price of wire.TelecommunicationsHowever, 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.I hope it is what you want.The SYN-ACK retransmission number server sends the SYN-ACK packet. If the customer confirmation packet is not received, the server retransmits for the first time, waits for a period of time but still does not receive the customer confirmation packet, and retransmits for the second time. If the retransmission number exceeds the maximum retransmission number specified by the system, the system deletes the connection information from the semi-connection queue. Note that the waiting time for each retransmission is not necessarily the same.Against Diluda