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HAPTER
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| Security Measures
ARP Inspection
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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.
CLI REFERENCES
â—† "ARP Inspection" on page 699
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.
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