每个 UDP 报文分为 UDP 报头和 UDP 数据区两部分。报头由 4 个 16 位长（2 字节）字段组成，分别说明该报文的源端口、目的端口、报文长度和校验值。 UDP 报文格式如图所示。 每个 UDP socket 都有一个接收缓冲区，****没有发送缓冲区****，从概念上来说就是只要有 ...

If you deal with network administration or security management, or if you are merely curious about what is passing by over your local network, grabbing some packets off the network card can be a ...