Avaya Configuring IP, ARP, RIP, and OSPF Services Manual de usuario descargar pdf (Pagina 32)

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Configuring IP, ARP, RIP, and OSPF Services

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117356-E Rev 00

Address Resolution Protocol (ARP)

The IP router needs both a physical address and an IP address to transmit a

datagram. If the router knows only the network host’s IP address, the Address

Resolution Protocol (ARP) enables the router to determine the network host’s

physical address by binding a 32-bit IP address to a 48-bit media access control

(MAC) address. A router can use ARP across a single network only, and the

network hardware must support physical broadcasts.

For example, in Figure 1-4

, the router and host C are on the same physical

network. Both devices have an assigned IP address (the router’s is 140.250.200.1

and host C’s is 140.250.200.4), and both devices have an assigned physical

address (the router’s is 00 00 A2 00 00 01 and host C’s is 00 00 A2 00 10 40).

Figure 1-4. ARP Example

140.250.200.0

140.250.200.1

00 00 A2 00 00 01

140.250.200.2

00 00 A2 00 10 20

140.250.200.3

00 00 A2 00 10 30

140.250.200.4

00 00 A2 00 10 40

Router

Host

IP0010A

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Avaya Configuring IP, ARP, RIP, and OSPF Services Manual de usuario Pagina 32

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