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The following DNS server address is preferred: 1.1. 1.1指着对面一间古色古香的茶楼道：这茶楼瞧着雅致，我们进去坐坐。一个失败的板球运动员决定在他30多岁的时候重返他的板球职业生涯，尽管每个人都对他的能力持怀疑态度According to the classification of flame retardant elements, it is divided into halogen-containing flame retardant, phosphorus-containing flame retardant, nitrogen-containing flame retardant, etc.吕老哥，你现在这么闲，都能跑到这里来喝汽水。黎水慌忙赔笑道：别急，我来解。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.