Transport Layer protocols, such as the Transmission Control Protocol (TCP), the User Datagram Protocol (UDP), specify a source and destination port number in their packet headers.
传输层协议，诸如传输控制协议（TCP），用户数据报协议（UDP）， 会在它们的头部指定一个资源和目的地的端口号。
Gets the number of User datagram Protocol (UDP) datagrams that were received and discarded because of errors other than bad port information.
获取侦听用户数据报协议(udp)数据报的本地终结点的数量。
The FRAG field indicates whether or not this datagram is one of a number of fragments.
FRAG区域指示是否这个数据包是片断序列中的一个。
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