Netgear M5300-52G3 Software Administration Manual - Page 288

ProSafe Managed Switch a. Select Security > Management Security > Radius > Server Configuration. A screen similar to the following displays. b. In the Radius Server IP Address field, enter 192.168.0.1. c. In the Secret Configured field, select Yes. d. In the Secret field, enter 12345. e. Click Add. Dynamic ARP Inspection Dynamic ARP inspection (DAI) is a security feature that rejects invalid and malicious ARP packets. The feature 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 bindings database of valid tuples (MAC address, IP address, VLAN interface). When DAI is enabled, the switch drops ARP packet if the sender MAC address and sender IP address do not match an entry in the DHCP snooping bindings database. However, it can be overcome through static mappings. Static mappings are useful when hosts configure static IP addresses, DHCP snooping cannot be run, or other switches in the network do not run 288 | Chapter 15. Security Management