ARP

The Ethernet Address Resolution Protocol (ARP), defines in RFC826/RFC903/RFC1931/RFC1293, serves the translation between hardware-address(MAC) and protokoll-address(IP).

8
16
32 bits

Hardware Type
Protocol Type

H-length
P-length
Operation

Sender Hardware Address

Sender Protocol Address

Target Hardware Address

Target Protocol Address

Hardware Type

1
Ethernet

2
Experimental Ethernet

3
Amateur Radio AX.25

4
Proteon ProNET Token Ring

5
Chaos

6
IEEE 802

7
ARCNET

8
Hyperchannel

9
Lanstar

10
Autonet Short Address

11
LocalTalk

12
LocalNet (IBM PCNet)

13
Ultralink

14
SMDS

15
Frame Relay

16
ATM

17
HDLC

...
...

Protocol Type

0x0800
IP

H-length
Length of the two hardware addresses in byte

P-length
Length of the two Protocol addresses in byte

Operation

1
ARP request

2
ARP responce

3
RARP request

4
RARP responce

5
Dynamic RARP request

6
Dynamic RARP reply

7
Dynamic RARP error

8
InARP request

9
InARP reply

...
...

Sender Hardware Address
hardware address of the sender

Sender Protocol Address
protocol address of the sender

Target Hardware Address
hardware address of the seeks

Target Protocol Address
protocol address of the seeks

8	16	32 bits
Hardware Type		Protocol Type
H-length	P-length	Operation
Sender Hardware Address
Sender Protocol Address
Target Hardware Address
Target Protocol Address