ARP Flooding Attack
The attacker broadcasts a mass of various fake ARP packets in a network segment to occupy the
network bandwidth viciously, which results in a dramatic slowdown of network speed. Meantime,
the Gateway learns the false IP address-to-MAC address mapping entries from these ARP
packets and updates its ARP table. As a result, the ARP table is fully occupied by the false entries
and unable to learn the ARP entries of legal Hosts, which causes that the legal Hosts can not
access the external network.
The IP-MAC Binding function allows the switch to bind the IP address, MAC address, VLAN ID
and the connected Port number of the Host together when the Host connects to the switch. Based
on the predefined IP-MAC Binding entries, the ARP Inspection functions to detect the ARP packets
and filter the illegal ARP packet so as to prevent the network from ARP attacks.
The ARP Inspection function is implemented on the ARP Detect, ARP Defend and ARP
Statistics pages.
11.2.1 ARP Detect
ARP Detect feature enables the switch to detect the ARP packets based on the bound entries in
the IP-MAC Binding Table and filter the illegal ARP packets, so as to prevent the network from
ARP attacks, such as the Network Gateway Spoofing and Man-In-The-Middle Attack, etc.
Choose the menu Network Security→ARP Inspection→ARP Detect to load the following page.
Figure 11-13 ARP Detect
The following entries are displayed on this screen:
ARP Detect
ARP Detect: Enable/Disable the ARP Detect function, and click the Apply
button to apply.
Trusted Port
Trusted Port: Select the port for which the ARP Detect function is unnecessary
as the Trusted Port. The specific ports, such as up-linked port,
routing port and LAG port, should be set as Trusted Port. To
ensure the normal communication of the switch, please configure
the ARP Trusted Port before enabling the ARP Detect function.
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