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ARP - Address Resolution Protocol

ARP - Address Resolution Protocol. RFC 826. Motivation. Converting Protocol Addresses (e.g., IP addresses) to Local Network Addresses (e.g., Ethernet addresses). Protocol Type. Hardware Type. Opcode. HAL. PAL. Sender ’ s Hardware Address (HAL bytes).

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ARP - Address Resolution Protocol

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  1. ARP -Address Resolution Protocol RFC 826

  2. Motivation • Converting Protocol Addresses (e.g., IP addresses) to Local Network Addresses (e.g., Ethernet addresses)

  3. Protocol Type Hardware Type Opcode HAL PAL Sender’s Hardware Address (HAL bytes) Sender’s Protocol Address (PAL bytes) Target’s Hardware Address (HAL bytes) Target’s Protocol Address (PAL bytes) Opcode 1: ARP Request 2: ARP Reply HAL: Byte length of hardware address PAL: Byte length of protocol address

  4. RARP –Reverse Address Resolution Protocol RFC 903

  5. Motivation • Network hosts such as diskless workstations frequently do not know their protocol addresses when booted; they often know only their hardware interface addresses. • To communicate using higher-level protocols like IP, they must discover their protocol address from some external source.

  6. Protocol Type Hardware Type Opcode HAL PAL Sender’s Hardware Address (HAL bytes) Sender’s Protocol Address (PAL bytes) Target’s Hardware Address (HAL bytes) Target’s Protocol Address (PAL bytes) Opcode 3: Request Reverse 4: Reply Reverse HAL: Byte length of hardware address PAL: Byte length of protocol address

  7. InARP –InverseAddress Resolution Protocol RFC 1293

  8. Motivation • Allow a station to request a protocol address corresponding to a given hardware address.

  9. Protocol Type Hardware Type Opcode HAL PAL Sender’s Hardware Address (HAL bytes) Sender’s Protocol Address (PAL bytes) Target’s Hardware Address (HAL bytes) Target’s Protocol Address (PAL bytes) Opcode 8: InARP Request 9: InARP Reply HAL: Byte length of hardware address PAL: Byte length of protocol address

  10. ARP Parameters • Hardware Type • Operation Code  http://www.iana.org/assignments/arp-parameters

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