This read-write TruthValue enables or disables validation that the sender MAC address inside an ARP packet's payload matches the source MAC address in its Ethernet header. An administrator enables this globally to catch ARP packets that lie about their true sender, a common spoofing technique. For example, enabling ctAgentDaiSrcMacValidate would cause Dynamic ARP Inspection to drop a crafted ARP request where the Ethernet source MAC differs from the sender MAC field inside the ARP packet.