Wireshark抓包里IP协议字符段的含义，我只知道是区分服务，但具体含义没搞明白，字段如下：
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
结合TCPIP协议详解看。
这个一般用在QoS方面
RFC 2474
Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers