This message means that the switch has received Address Resolution Protocol (ARP) packets considered invalid by ARP inspection. The packets are erroneous, and their presence can show attempted man-in-the-middle attacks in the network. This log message appears when the IP and MAC address of the sender binding for the received VLAN is not present in the DHCP snooping database.
You receive this message when the MAC address does not match the binding. In order to display the DHCP snooping binding entries, use the show ip dhcp snooping binding command. If the device does not use DHCP or the information is correct and you trust the device on the port, you can enable trust on that port with the ip arp inspection trust command. Also, DHCP snooping must be enabled in order to permit ARP packets that have dynamically assigned IP addresses with the ip dhcp snooping command.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...