Urg: Indicates to the receiver to do urgent processing as long as there is data to be consumed.

URG：向接收方表明一接收完数据就进行紧急处理。

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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。

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