Chapter 12
| Security Measures
ARP Inspection
– 313 –
Configuring Global
Settings for ARP
Inspection
Use the Security > ARP Inspection (Configure General) page to enable ARP
inspection globally for the switch, to validate address information in each packet,
and configure logging.
Command Usage
ARP Inspection Validation
â—† By default, ARP Inspection Validation is disabled.
â—† Specifying at least one of the following validations enables ARP Inspection
Validation globally. Any combination of the following checks can be active
concurrently.
â–
Destination MAC – Checks the destination MAC address in the Ethernet
header against the target MAC address in the ARP body. This check is
performed for ARP responses. When enabled, packets with different MAC
addresses are classified as invalid and are dropped.
â–
IP – Checks the ARP body for invalid and unexpected IP addresses. These
addresses include 0.0.0.0, 255.255.255.255, and all IP multicast addresses.
Sender IP addresses are checked in all ARP requests and responses, while
target IP addresses are checked only in ARP responses.
â–
Source MAC – Checks the source MAC address in the Ethernet header
against the sender MAC address in the ARP body. This check is performed
on both ARP requests and responses. When enabled, packets with different
MAC addresses are classified as invalid and are dropped.
ARP Inspection Logging
â—† By default, logging is active for ARP Inspection, and cannot be disabled.
â—† The administrator can configure the log facility rate.
â—† When the switch drops a packet, it places an entry in the log buffer, then
generates a system message on a rate-controlled basis. After the system
message is generated, the entry is cleared from the log buffer.
â—† Each log entry contains flow information, such as the receiving VLAN, the port
number, the source and destination IP addresses, and the source and
destination MAC addresses.
â—† If multiple, identical invalid ARP packets are received consecutively on the
same VLAN, then the logging facility will only generate one entry in the log
buffer and one corresponding system message.
â—† If the log buffer is full, the oldest entry will be replaced with the newest entry.
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