Chapter 12
| Security Measures
ARP Inspection
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When ARP Inspection is disabled, all ARP request and reply packets will
bypass the ARP Inspection engine and their switching behavior will match
that of all other packets.
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Disabling and then re-enabling global ARP Inspection will not affect the
ARP Inspection configuration of any VLANs.
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When ARP Inspection is disabled globally, it is still possible to configure
ARP Inspection for individual VLANs. These configuration changes will only
become active after ARP Inspection is enabled globally again.
â—† The ARP Inspection engine in the current firmware version does not support
ARP Inspection on trunk ports.
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.
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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.
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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.
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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.
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