udp

引用：http://zoufengfu168.blog.163.com/blog/static/5461055200991333616451/ 一、MAC帧头定义 [c] typedef struct _MAC_FRAME_HEADER { char m_cDstMacAddress[6]; //目的mac地址 char m_cSrcMacAddress[6]; //源mac地址 /* 如0x0800代表上一层是IP协议，0x0806为arp, 0x88a4为Ethercat */ short m_cType; //上一层协议类型， }__attribute__((packed))MAC_FRAME_HEADER,*PMAC_FRAME_HEADER; Etherne II 长度为14 byte; typedef struct _MAC_FRAME_TAIL { unsigned int m_sCheckSum; //数据帧尾校验和 }__attribute__((packed))MAC_FRAME_TAIL, *PMAC_FRAME_TAIL; [/c] 补充VLAN 和ARP： [c] // #define ETHTYPE_ARP 0x0806U #define ETHTYPE_IP 0x0800U #define ETHTYPE_VLAN 0x8100U #define ETHTYPE_PPPOEDISC 0x8863U /* PPP Over Ethernet Discovery Stage */ #define ETHTYPE_PPPOE 0x8864U /* PPP Over Ethernet Session Stage */ /** VLAN header inserted between ethernet header and payload * if ‘type’ in ethernet header is ETHTYPE_VLAN.