ARP Request/Reply

Can we modify our previous device-driver so it will allow us to send and receive ‘raw’ packets?

ARP packet (Type 0x0806)

EthernetHeader

ARPProtocol Header

Data (optional)

14 bytes 28 bytes

ARP packet-header

Hardware Type Protocol Type

HardwareLength

Operation (1=request, 2=reply)

Sender Hardware Address(upper 4 octets)

Sender Protocol Address (LSW)

Sender Hardware Address(lower 2 octets)

Sender Protocol Address (MSW)

Target Hardware Address (lower 4 octets)

ProtocolLength

Target Hardware Address(upper 2 octets)

32 bits

For Ethernet: Hardware Type = 0x0001, Hardware Length = 0x06 For Internet: Protocol Type = 0x0800, Protocol Length = 0x04

Target Protocol Address

ARP request and reply