Digisol DG-FS4528P, Management Manual

Page: 226 / 973

C
HAPTER
7 | Security Measures
ARP Inspection
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ARP Inspection Logging
By default, logging is active for ARP Inspection, and cannot be disabled.
The administrator can configure the log facility rate.
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.
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.
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.
If the log buffer is full, the oldest entry will be replaced with the newest
entry.
P
ARAMETERS
These parameters are displayed:
DAI Status – Enables Dynamic ARP Inspection globally.
(Default: Disabled)
Need Additional Validation – Enables extended ARP Inspection
Validation if any of the following options are enabled.
(Default: Disabled)
Source MAC Validation – Validates 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.
Destination MAC Validation – Validates the destination MAC
address in the Ethernet header against the target MAC address in
the body of ARP responses.
IP Address Validation – Checks the ARP body for invalid and
unexpected IP addresses. Sender IP addresses are checked in all
ARP requests and responses, while target IP addresses are checked
only in ARP responses.
Log Message Number – The maximum number of entries saved in a
log message. (Range: 0-256; Default: 5)
Log Message Interval – The interval at which log messages are sent.
(Range: 0-86400 seconds; Default: 1 second)