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Index of /Kuliah2013-2014/JaringanKomputer/JarKom

ARP

Electronic Engineering Polytechnic Institut of Surabaya – ITS
Kampus ITS Sukolilo Surabaya 60111

ARP
ARP kepanjangan dari Address Resolution Protocol,
suatu protokol yang bertugas mengolah pengalamatan
logik dan fisik jaringan
ARP mengolah sebuah tabel yang berisi Mapping
antara IP-address dan Ethernet Card.
Tabel arp didapatkan dari request (broadcast) ke
jaringan.
Berada pada layer 3 Jaringan

Electronic Engineering Polytechnic Institut of Surabaya – ITS Kampus ITS Sukolilo 60111

Mengapa Butuh Mapping
MAC Address dengan IP Address
Jika
host

ingin
berkomunikasi IP host
tertentu,
Komputer
sumber
akan
melakukan
pengecekan
nomor
MAC dari komputer
tujuan di Tabel ARP
Jika di tabel ARP tidak
ditemukan,
maka
melakukan
arp
request

???


00-0C-04-17-91-CC

172.16.10.25 172.16.10.10

Electronic Engineering Polytechnic Institut of Surabaya – ITS Kampus ITS Sukolilo 60111

ARP Request
Ethernet Header
Ethernet
Destination
Address
(MAC)

Ethernet
Source
Address
(MAC)

Ethernet Data – 28 byte ARP request/reply
Frame

Type

ARP
headers
, i.e. op
field

Sender’s
Ethernet Address
(MAC)

Sender’s
IP Address

Target’s
Ethernet Address
(MAC)

Target’s
IP Address


Electronic Engineering Polytechnic Institut of Surabaya – ITS Kampus ITS Sukolilo 60111

Destination MAC Address???

IP Address
172.16.10.3
172.16.10.19
172.16.10.33

ARP Table
MAC Address
00-0C-04-32-14-A1
00-0C-14-02-00-19
00-0C-A6-19-46-C1

ARP Request

Host Stevens
172.16.10.10

255.255.255.0
MAC 00-0C-04-17-91-CC

Host Cerf
172.16.10.25
255.255.255.0
MAC 00-0C-04-38-44-AA

Source

Destination

172.16.10.0/24

Router A
Ethernet 0
172.16.10.1
255.255.255.0
MAC 03-0D-17-8A-F1-32


ARP Request from 172.16.10.10
Ethernet Header
Ethernet
Destination
Address
(MAC)
FF-FFFF-FFFF-FF

Ethernet
Source
Address
(MAC)
00-0C04-1791-CC

Ethernet Data – 28 byte ARP request/reply
Frame
Type

0x806


ARP
headers
, i.e. op
field
op = 1

Sender’s
Ethernet
Address
(MAC)
00-0C04-1791-CC

Sender’s
IP Address

172.16.10.10

Target’s
Ethernet
Address

(MAC)

Target’s
IP Address

172.16.10.25

Electronic Engineering Polytechnic Institut of Surabaya – ITS Kampus ITS Sukolilo 60111

Destination MAC Address???

IP Address
172.16.10.3
172.16.10.19
172.16.10.33

ARP Table
MAC Address
00-0C-04-32-14-A1
00-0C-14-02-00-19

00-0C-A6-19-46-C1

Host Stevens
172.16.10.10
255.255.255.0
MAC 00-0C-04-17-91-CC

Host Cerf
172.16.10.25
255.255.255.0
MAC 00-0C-04-38-44-AA

Source

Destination

172.16.10.0/24

Router A


ARP Reply
ARP Reply dari Host Cerf
“Hey pengirim ARP Request!
Ini alamat MAC yang kamu
butuhkan.”

Ethernet 0
172.16.10.1
255.255.255.0
MAC 03-0D-17-8A-F1-32

Data link destination address

Data link source address Other data link fields

00-0C-04-38-44-AA 00-0C-04-17-91-CC

IP Destination Address

IP Source Address Other IP fields and data


172.16.10.25 172.16.10.10

ARP Reply from 172.16.10.25
Ethernet Header
Ethernet
Destination
Address
(MAC)
00-0C04-1791-CC

Ethernet
Source
Address
(MAC)
00-0C04-3844-AA

Ethernet Data – 28 byte ARP request/reply
Frame
Type

0x806

ARP
headers
, i.e. op
field
op = 2

Sender’s
Ethernet
Address
(MAC)
00-0C04-3844-AA

Sender’s
IP Address

172.16.10.25

Ini dia

Target’s
Ethernet
Address
(MAC)
00-0C04-1791-CC

Target’s
IP Address

172.16.10.10

Electronic Engineering Polytechnic Institut of Surabaya – ITS Kampus ITS Sukolilo 60111

Destination MAC Address???

IP Address
172.16.10.3
172.16.10.19
172.16.10.33

ARP Table
MAC Address
00-0C-04-32-14-A1
00-0C-14-02-00-19
00-0C-A6-19-46-C1

Added to ARP Table
172.16.10.25 00-0C-04-38-44-AA

Host Stevens
172.16.10.10
255.255.255.0
MAC 00-0C-04-17-91-CC

ARP Reply

Host Cerf
172.16.10.25
255.255.255.0
MAC 00-0C-04-38-44-AA

Source

Host Stevens menerima
ARP Reply dan memasukkan
IP address dan MAC address
ke tabel ARP-nya.
Selanjutnya Host Stevens
bisa mengirimkan paket
secara langsung ke Host
Cerf.

Destination

172.16.10.0/24

Router A
Ethernet 0
172.16.10.1
255.255.255.0
MAC 03-0D-17-8A-F1-32

Data link destination address

Data link source address Other data link fields

00-0C-04-38-44-AA 00-0C-04-17-91-CC

IP Destination Address

IP Source Address Other IP fields and data

172.16.10.25 172.16.10.10

Ethernet Frame
Ethernet Header
MAC
Destination
Address

MAC
Source Address

00-0C04-3844-AA

00-0C04-1791-CC

IP Datagram from above
Other
Header
Info

IP
Header
Info

IP Original
Source
Address

IP Final
Destination
Address

172.17.10.10

172.16.10.25

Data

Ethernet
Trailer
FCS

Electronic Engineering Polytechnic Institut of Surabaya – ITS Kampus ITS Sukolilo 60111

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