8051 and DM9000 First ARP Packet

Packet in = 0040

Packet Pointer = 3110

Packet Length = 0040

0000 FF FF FF FF FF FF 00 1F C6 37 5B 64 08 06 00 01

0010 08 00 06 04 00 01 00 1F C6 37 5B 64 C0 A8 00 67

0020 00 00 00 00 00 00 C0 A8 00 14 00 00 00 00 00 00

0030 00 00 00 00 00 00 00 00 00 00 00 00 84 7F F9 44

This is first packet which we get from DM9000, When Sender didn’t know target MAC address, sender will send this packet first to ask target MAC address who own this IP address.

a. Ethernet header: Dest MAC + Src MAC + Protocol
First 14 bytes were be define ethernet header, and  0806 is ARM protocol, 0800 is IP protocol.

b. Hardware type:  0001 is Ethernet, 0006 is Token Ring.
c. Protocol Type: 0800 is IP protocol.

d. Hard Address Length:  06 means it has 6 bytes address.

e. Protocol Address length: 04 means it has 4 bytes address.

f. Command: 0001 is ARP request command.

g. Source MAC address:
h. Source IP address:
i. Destination MAC address:
j. Destination IP address:

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