When a new TCP connection comes in from a client by means of a packet with the SYN bit set, the server creates an entry for the half-open connection and responds with a SYN-ACK packet.
当从客户机发来新的TCP连接时，数据包设置了SY n位，服务器就为这个半开的连接创建一个条目，并用一个SYN - ACK数据包进行响应。
In response, the scanned host returns a packet with the SYN and ack flags set if the port is open.
如果该端口是打开的，则被扫描主机返回设置了syn和ack标志的包进行响应。
The server answers with a packet where both the SYN and ACK flags are set.
服务器以设置了 SYN和ACK 标志的包应答。
An attack called the SYN flood ensures that the ack packet never returns so that the server runs out of room to process incoming connections.
有一种称为syn泛滥(SYN flood)的网络攻击，它使ack数据包无法返回，导致服务器用光内存空间，无法处理到来的连接。
You can specify which incoming TCP packets to scan and discard those that don't match the flags ack, FIN, PSH, RST, SYN, or URG.
可以指定应该扫描哪些到达的TCP数据包，丢弃不与ack、FIN、P SH、RST、syn或urg标志匹配的数据包。
The tcp_input () routine on the client side processes the SYN ACK packet, and calls tcp_output () to send an ACK packet back to the server.
客户端上的 tcp_input ()例程处理SYN ACK包，并调用 tcp_output ()将 ACK 包发回到服务器。
The tcp_input () routine on the client side processes the SYN ACK packet, and calls tcp_output () to send an ACK packet back to the server.
客户端上的 tcp_input ()例程处理SYN ACK包，并调用 tcp_output ()将 ACK 包发回到服务器。
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