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Choose the menu Network Security→ARP Inspection→ARP Statistics to load the following
page.
Figure 12-15 ARP Statistics
The following entries are displayed on this screen:
Auto Refresh
Auto Refresh:
Enable/Disable the Auto Refresh feature.
Ref
resh Interval: Specify the refresh interval to display the ARP Statistics.
Illegal ARP Packet
Port:
Displays the port number.
Trusted Port:
Indicates the port is an ARP Trusted Port or not.
Illegal ARP Packet:
Displays the number of the received illegal ARP packets.
12.3 DoS Defend
DoS (Denial of Service) Attack is to occupy the network bandwidth maliciously by the network
attackers or the evil programs sending a lot of service requests to the Host, which incurs an
abnormal service or even breakdown of the network.
With DoS Defend function enabled, the switch can analyze the specific fields of the IP packets and
distinguish the malicious DoS attack packets. Upon detecting the packets, the switch will discard
the illegal packets directly and limit the transmission rate of the legal packets if the over legal
packets may incur a breakdown of the network. The switch can defend a few types of DoS attack
listed in the following table.
192