Configuring Dynamic Arp Inspection; Dai Configuration; Figure 171: Dynamic Arp Inspection Configuration; Table 154: Dynamic Arp Inspection Configuration - D-Link DWL-8600AP User Manual

D-Link UWS User Manual

Configuring Dynamic ARP Inspection

Dynamic ARP Inspection (DAI) is a security feature that rejects invalid and malicious ARP packets. DAI prevents
a class of man-in-the-middle attacks, where an unfriendly station intercepts traffic for other stations by
poisoning the ARP caches of its unsuspecting neighbors. The miscreant sends ARP requests or responses
mapping another station's IP address to its own MAC address.
DAI relies on DHCP snooping. DHCP snooping listens to DHCP message exchanges and builds a binding
database of valid {MAC address, IP address, VLAN, and interface} tuples.
When DAI is enabled, the switch drops ARP packets whose sender MAC address and sender IP address do not
match an entry in the DHCP snooping bindings database. You can optionally configure additional ARP packet
validation.

DAI Configuration

Use the DAI Configuration page to configure global DAI settings.
To display the DAI Configuration page, click LAN > L2 Features>Dynamic ARP Inspection > DAI Configuration
in the navigation tree.
Field Description
Validate Source Select the DAI Source MAC Validation Mode for the switch. If you select Enable, Sender
MAC MAC validation for the ARP packets will be enabled. The default is Disable.
Validate Select the DAI Destination MAC Validation Mode for the switch. If you select Enable,
Destination MAC Destination MAC validation for the ARP Response packets will be enabled. The default is
Disable.
Validate IP Select the DAI IP Validation Mode for the switch. If you select Enable, IP Address validation
for the ARP packets will be enabled. The default is Disable.
• Click Submit to apply the new configuration and cause the change to take effect. These changes will not
be retained across a power cycle unless a Save configuration is performed.
D-Link
Oct. 2015

Figure 171: Dynamic ARP Inspection Configuration

Table 154: Dynamic ARP Inspection Configuration

Configuring Dynamic ARP Inspection
Unified Wired and Wireless Access System
Page 274