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Public abstract class User {The other is a disguised ACK packet that responds to SYN-ACK to reach the server through firewall/proxy. This disguise prevents the TCB of the server from staying in the SYN-RECEIVED state, thus ensuring free space in the backlog queue. The firewall/proxy will stay and wait for a period of time. If the correct ACK of the connection initiator is not detected, it will pass through the disguised TCP? The RET message causes the server to release the TCB. For legitimate connections, packet flow can continue without the influence of firewalls/proxies. This method is more attractive than the above method of disguising SYN-ACK, because the firewall/agent does not need to directly participate in the connection after the legal connection is established.少年盯着香荽，咬牙道：死香荽。该片是1989根据荣获第三届矛盾文学奖的路遥的同名小说《平凡的世界》而改编的电视连续剧。香荽却飞奔过来，抱住张老太太的大腿，仰头笑弯了眼睛，娇嫩的嗓音沁人心扉：奶奶，你家来了。"Yes, it's the kind of big rats. They are more difficult to deal with than big wasps. Especially when these two things go together, one is in the sky and the other is underground. We should be too busy to take care of them. Moreover, the kind of big rats have very strong teeth. It's a piece of cake to bite off their arms and legs in three or two, and they move very quickly." Zhang Xiaobo said.