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263
Configuring ARP
This chapter describes how to configure the Address Resolution Protocol (ARP).
Overview
ARP resolves IP addresses into MAC addresses on Ethernet networks.
ARP message format
ARP messages are classified into ARP requests and ARP replies.
Figure 229
shows the format of the ARP
request/reply messages. Numbers in the figure refer to field lengths.
Figure 229
ARP message format
The following describe the fields in
Figure 229
:
•
Hardware type
—The hardware address type. The value 1 represents Ethernet.
•
Protocol
type
—The type of the protocol address to be mapped. The hexadecimal value 0x0800
represents IP.
•
Hardware
address
length
and
protocol
address
length
—Length, in bytes, of a hardware address
and a protocol address, in bytes. For an Ethernet address, the value of the hardware address length
field is 6. For an IPv4 address, the value of the protocol address length field is 4.
•
OP
—Operation code. The type of the ARP message. The value 1 represents an ARP request and 2
represents an ARP reply.
•
Sender
hardware
address
—Hardware address of the device sending the message.
•
Sender
protocol
address
—Protocol address of the device sending the message.
•
Target
hardware
address
—Hardware address of the device the message is being sent to.
•
Target
protocol
address
—Protocol address of the device the message is being sent to.
ARP operating mechanism
As shown in
Figure 230
, Host A and Host B are on the same subnet. Host A sends a packet to Host B as
follows:
Содержание Compaq Presario,Presario 1910
Страница 35: ...22 Figure 16 Sort display based on MAC address in the ascending order ...
Страница 54: ...41 Figure 27 Configuration finishes ...
Страница 70: ...57 Figure 42 Configuring idle timeout period 3 Set the idle timeout period for logged in users 4 Click Apply ...
Страница 98: ...85 Figure 67 Displaying the rate settings of ports ...
Страница 114: ...101 Figure 82 Port traffic statistics NOTE When the bandwidth utilization is lower than 1 1 is displayed ...
Страница 158: ...145 Field Description OutErrors Number of invalid packets sent through the interface ...
Страница 202: ...189 Figure 177 Creating a static MAC address entry ...
Страница 230: ...217 Figure 193 Configuring MSTP globally on Switch D ...
Страница 359: ...346 5 View the operation result in the Summary area Figure 316 IPv6 traceroute operation result ...