
Industrial Managed
Ethernet Switch
User Manual
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DAI will drop all ARP packets if the IP-to-MAC binding is not present in the DHCP snooping bindings database.
However, if some static IP addressis needed to pass through the switch, the user should add this static IP-to-MAC
binding in the
ARP Spoof Prevention
webpage in Section 2.14.4. This static mapping is useful when nodes
configure static IP addreses, DHCP snooping cannot be run, or other switches in the network do not run dynamic
ARP inspection.
To enable DAI, check the
Enabled
box for
DAI
option inside the
DAI with DHCP
box as shown in Figure 2.139.
Then, check the box under the
Trust
column for corresponding
Port
number to configure that port number as
trusted port. Then click
Update
button. The table inside the
DHCP Data
box will show information of the
IP
-to-
MAC
mapping, the
Request Port
and
Lease Time
of DHCP. To obtain the lastest information on the bindings table, click
on the
Refresh
button. Note that if the DHCP Snooping was not enabled before enabling the dynamic ARP
inspection with DHCP, the user will encounter the message shown in Figure 2.140.
Figure 2.139 Dynamic ARP Inspection Webpage
Figure 2.140 Error Message for Dynamic ARP Inspection when DHCP Snooping was disabled.