ARP/RARP Packet Format The ARP (Address Resolution Protocol) is used to resolve IP addresses into MAC addresses. The RARP (Reverse Address Resolution Protocol) is used to resolve MAC addresses into IP addresses. Packet Format +0---7---15---23---31 | Ethernet Address of destination(0-47)...
The length of an ARP packet is 42 bytes. The first 14 bytes represent an Ethernet frame header, and the last 28 bytes contain the ARP packet information. Figure Format of an ARP Request or Reply packet shows the format of an ARP packet. ...
unsigned short arp_pro; /* format of protocol address */ unsigned char arp_hln; /* length of hardware address */ unsigned char arp_pln; /* length of protocol address */ unsigned short arp_op; /* ARP/RARP operation */ unsigned char arp_sha[6]; /* sender hardware addr...
{//arp首部unsignedshortarp_hrd;/*format of hardware address*/unsignedshortarp_pro;/*format of protocol address*/unsignedchararp_hln;/*length of hardware address*/unsignedchararp_pln;/*length of protocol address*/unsignedshortarp_op;/*ARP/RARP operation*/unsignedchararp_sha[6];/*sender hardware...
unsigned short arp_pro; /* format of protocol address */ unsigned char arp_hln; /* length of hardware address */ unsigned char arp_pln; /* length of protocol address */ unsigned short arp_op; /* ARP/RARP operation */ unsigned char arp_sha[6]; /* sender hardware address */ ...
/* 协议类型 format of protocol address */u_char ar_hln;/* 硬件地址长度 length of hardware address */u_char ar_pln;/* 协议地址长度 length of protocol address */u_short ar_op;/* 操作码 one of: */#defineARPOP_REQUEST 1/* request to resolve address */#defineARPOP_REPLY 2/* ...
ARPPACKET ARPPacket; // 定义ARPPACKET结构体变量 memset(&ARPPacket, 0, sizeof(ARPPACKET)); // 数据包初始化 formatStrToMAC(“DLC源MAC字符串”,ARPPacket.dlcHeader.SrcMAC); // DLC帧头 formatStrToMAC(“DLC目的MAC字符串”,ARPPacket.dlcHeader.DesMAC); ...
Packet structure [edit] The Address Resolution Protocol uses a simple message format that contains one address resolution request or response. The size of the ARP message depends on the upper layer and lower layer address sizes, which are given by the type of networking protocol (usuallyIPv4) in...
unsigned short arp_pro; /* format of protocol address */ unsigned char arp_hln; /* length of hardware address */ unsigned char arp_pln; /* length of protocol address */ unsigned short arp_op; /* ARP/RARP operation */unsigned char arp_sha[6]; /* sender hardware address */ ...
ARP Packet Format Figure 2-2 shows the format of an ARP Request or Reply packet. Figure 2-2 Format of an ARP Request or Reply packet The length of an ARP packet is 42 bytes. The first 14 bytes indicate the Ethernet frame header, and the last 28 bytes are the content of the ARP ...