ARP/RARP/DARP

Standard reference: 

  • RFC826 - Address Resolution Protocol
  • RFC903 - RARP - Reverse ARP and DARP: Dynamic ARP

Structure of messages: 

length field
2 octets Hardware Address Space
2 octets Protocol Address Space
1 octet Hardware Address Length = n
1 octet Protocol Address Length = m
2 octets Opcode
n octets Sender Hardware Address
m octets Sender Protocol Address
n octets Target Hardware Address
m octets Target Protocol Address

The packet type depends on the opcode:

Opcode Packet type
1 ARP Request
2 ARP Reply
3 RARP Request
4 RARP Reply
5 DRARP Request
6 DRARP Reply
DRARP Error

 

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updated:  27-Feb-04