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101
ARP configuration
Overview
Introduction to ARP
The Address Resolution Protocol (ARP) is used to resolve an IP address into an Ethernet MAC address (or
physical address).
In an Ethernet LAN, a device uses ARP to resolve the IP address of the next hop to the corresponding
MAC address.
NOTE:
For more information about ARP, see
H3C WA Series Access Points Layer 3 Configuration Guide.
Introduction to gratuitous ARP
Gratuitous ARP packets
In a gratuitous ARP packet, the sender IP address and the target IP address are the IP address of the
sending device, the sender MAC address is the MAC address of the sending device, and the target MAC
address is the broadcast address ff:ff:ff:ff:ff:ff.
A device sends a gratuitous ARP packet for either of the following purposes:
•
Determine whether its IP address is already used by another device. If the IP address is already used,
the device will be informed of the conflict by an ARP reply.
•
Inform other devices of the change of its MAC address.
Learning of gratuitous ARP packets
With this feature enabled, a device, upon receiving a gratuitous ARP packet, adds an ARP entry that
contains the sender IP and MAC addresses in the packet to its ARP table. If the corresponding ARP entry
exists, the device updates the ARP entry.
With this feature disabled, the device uses the received gratuitous ARP packets to update existing ARP
entries, but not to create new ARP entries.
Displaying ARP entries
Select
Network
>
ARP Management
from the navigation tree to enter the default
ARP Table
page shown
. All ARP entries are displayed on the page.
Содержание WA2612-AGN
Страница 106: ...93 Figure 90 Create a static MAC address entry ...
Страница 126: ...113 Figure 116 Information about an IGMP snooping multicast entry ...
Страница 145: ...132 Enter 10 1 1 2 for Gateway Address c Click Apply Figure 133 Configure a dynamic address pool for the DHCP server ...
Страница 187: ...174 Figure 174 Firefox web browser setting ...
Страница 219: ...206 Figure 202 Common configuration area 6 Configure the advanced parameters ...
Страница 243: ...230 Number of users Real time accounting interval in minutes 500 to 999 12 1000 15 ...
Страница 278: ...265 Figure 266 Network diagram LAN Segment ...
Страница 339: ...326 Figure 348 Configure the wireless card I ...
Страница 340: ...327 Figure 349 Configure the wireless card II ...
Страница 346: ...333 Figure 357 Configure the wireless card II ...