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Which chains can use the rules in the nat table: PREROUTING, OUTPUT, POSTROUTING (INPUT also in centos7, not in centos6)At this time, the reaction may be extremely slow or disappear. Although the eyes look open or half open, they cannot see the things in the surrounding environment.Is it TCP to try to send enough SYN packets and run out of backlog? The purpose of SYN flooding. The attacker added the source IP address to the SYN packet, which would not cause the host to remove the assigned TCB from the SYN-RECEVIED state queue (because the host would respond to the SYN-ACK). Because TCP is reliable, the destination host will wait quite a long time before disconnecting the half-open connection and removing the TCB from the SYN-RECIEVED queue. During this period, the server will not be able to respond to legitimate new TCP connection requests from other applications. Figure 2 shows a simple TCP? The process of a SYN flooding attack.The elderly caretaker of a remote morgue possesses an impeccable memory for everything but names. He passes his days showing corpses to those searching for their lost ones and tending to his beloved plants. When protest in a nearby city breaks out and the militia covertly raid the morgue to hide civilian casualties, he discovers the body of an unknown young woman. Evoking memories of personal loss, he embarks on a magical odyssey to give her a proper burial with the help of a mystic gravedigger who collects stories of the dead, an old woman searching for her long-lost daughter, and a hearse driver tormented by his past.Step 4: Release the startup key/power key, and the HOME key will not be put on for 15 seconds. This step can enter DFU. At this time, the mobile phone is black screen, but iTunes can recognize it.张大胆受不住了，大叫一声，撒腿就跑。