Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link)
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: ????
---------------
IPv4
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link)
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: ????
---------------
IPv4
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: ff:ff:ff:ff:ff
---------------
Arp Request for 10.40.8.1
H1 sends an ARP request to find the MAC of the router (he already knows its IP)
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link)
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: ????
---------------
IPv4
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: ff:ff:ff:ff:ff
---------------
Arp Request for 10.40.8.1
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link) - The router responds to the ARP Request with an ARP reply
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: ????
---------------
IPv4
Etherne:
MAC Src: 2c:f8:9b:34:e1:be
MAC Dst: f0:b6:1e:bb:1a:3e
---------------
Arp reply 10.40.8.1 is at 2c:f8:9b:34:e1:be
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link) - The router responds to the ARP Request with an ARP reply
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: ????
---------------
IPv4
Etherne:
MAC Src: 2c:f8:9b:34:e1:be
MAC Dst: f0:b6:1e:bb:1a:3e
---------------
Arp reply 10.40.8.1 is at 2c:f8:9b:34:e1:be
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link) - The router responds to the ARP Request with an ARP reply
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: 2c:f8:9b:34:e1:be
---------------
IPv4
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link) - The router responds to the ARP Request with an ARP reply
- Now the router doesn't know the MAC of the next Hop
12.14.6.20 (H2) which is connected on Port 1.
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: 2c:f8:9b:34:e1:be
---------------
IPv4
Etherne:
MAC Src: 2c:f8:9b:34:e1:be
MAC Dst: ff:ff:ff:ff:ff
---------------
Arp Request for 12.14.6.20
The router sends an ARP Request
The Packet is in queue because we want to be able to receive other packets in the meantime
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link) - The router responds to the ARP Request with an ARP reply
- Now the router doesn't know the MAC of the next Hop
12.14.6.20 (H2) which is connected on Port 1.
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: 2c:f8:9b:34:e1:be
---------------
IPv4
Etherne:
MAC Src: 2c:f8:9b:34:e1:be
MAC Dst: ff:ff:ff:ff:ff
---------------
Arp Request for 12.14.6.20
The Packet is in queue because we want to be able to receive other packets in the meantime
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link) - The router responds to the ARP Request with an ARP reply
- Now the router doesn't know the MAC of the next Hop
12.14.6.20 (H2) which is connected on Port 1.
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: 2c:f8:9b:34:e1:be
---------------
IPv4
Etherne:
MAC Src: 2c:f8:9b:34:e1:be
MAC Dst: ff:ff:ff:ff:ff
---------------
Arp Request for 12.14.6.20
Etherne:
MAC Src: a0:36:5d:1b:6a:ee
MAC Dst: 2c:f8:9b:34:e1:be
---------------
Arp Reply 12.14.6.20 is at a0:36:5d:1b:6a:ee
The Packet is in queue because we want to be able to receive other packets in the meantime
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
| 12.14.6.20 | a0:36:5d:1b:6a:ee |
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link) - The router responds to the ARP Request with an ARP reply
- Now the router doesn't know the MAC of the next Hop
12.14.6.20 (H2) which is connected on Port 1. - The router updated the ARP cache table with the info from the reply
Etherne:
MAC Src: f0:b6:1e:bb:1a:3e
MAC Dst: 2c:f8:9b:34:e1:be
---------------
IPv4
Etherne:
MAC Src: a0:36:5d:1b:6a:ee
MAC Dst: 2c:f8:9b:34:e1:be
---------------
Arp Reply 12.14.6.20 is at a0:36:5d:1b:6a:ee
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
| 12.14.6.20 | a0:36:5d:1b:6a:ee |
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link) - The router responds to the ARP Request with an ARP reply
- Now the router doesn't know the MAC of the next Hop
12.14.6.20 (H2) which is connected on Port 1. - The router updated the ARP cache table with the info from the reply
Etherne:
MAC Src: 2c:f8:9b:34:e1:be
MAC Dst: a0:36:5d:1b:6a:ee
---------------
IPv4
Router 1
IP:10.40.8.29
MAC:f0:b6:1e:bb:1a:3e
IP:12.14.6.20
MAC:a0:36:5d:1b:6a:ee
Port: 0
IP: 10.40.8.1
Port: 1
IP: 12.14.6.1
MAC: 2c:f8:9b:34:e1:be
H1
| IP | MAC |
|---|---|
| 12.14.6.20 | a0:36:5d:1b:6a:ee |
Tabela cache ARP
H1
H2
- Initially no one know anyone's MAC
- H1 wants to send an IPv4 packet to H2, but doesn't know
the Router's MAC (directly connected over the Link) - The router responds to the ARP Request with an ARP reply
- Now the router doesn't know the MAC of the next Hop
12.14.6.20 (H2) which is connected on Port 1. - The router updated the ARP cache table with the info from the reply
Etherne:
MAC Src: 2c:f8:9b:34:e1:be
MAC Dst: a0:36:5d:1b:6a:ee
---------------
IPv4