Table of Contents
How does ARP inspection work?
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.
How does ARP work in an IP network?
ARP broadcasts a request packet to all the machines on the LAN and asks if any of the machines are using that particular IP address. When a machine recognizes the IP address as its own, it sends a reply so ARP can update the cache for future reference and proceed with the communication.
What is Dynamic ARP Inspection Cisco?
Dynamic ARP inspection is a security feature that validates ARP packets in a network. It intercepts, logs,and discards ARP packets with invalid IP-to-MAC address bindings. This capability protects the network from certain man-in-the-middle attacks.
Which command can you use to see the effect of dynamic ARP inspection on your switch?
Use the show ip arp inspection vlan [vlan# or range] command to display the DAI configuration and the operation state of the VLANs configured on the switch.
What is ARP spoofing explain ARP spoofing detection/prevention and protection?
Updated: 4/27/2021. ARP Poisoning is a type of cyberattack that abuses weaknesses in the widely used Address Resolution Protocol (ARP) to disrupt, redirect, or spy on network traffic.
What is the difference between ARP spoofing and ARP poisoning?
ARP spoofing: A hacker sends fake ARP packets that link an attacker’s MAC address with an IP of a computer already on the LAN. ARP poisoning: After a successful ARP spoofing, a hacker changes the company’s ARP table, so it contains falsified MAC maps.
How do I disable dynamic ARP inspection?
To disable dynamic ARP inspection, use the no ip arp inspection vlan vlan-range global configuration command. To return the interfaces to an untrusted state, use the no ip arp inspection trust interface configuration command.
What is dynamic ARP inspection in networking?
Overview of Dynamic ARP Inspection. Dynamic ARP Inspection (DAI) is a security feature that validates Address Resolution Protocol (ARP) packets in a network. DAI allows a network administrator to intercept, log, and discard ARP packets with invalid MAC address to IP address bindings. This capability protects the network from certain
What is an ARP attack?
ARP attacks can be done as a Man-in-the-Middle Attack by an attacker. By capturing the traffic between two hosts, attacker poisons the ARP Cache and sends his/her own address as requested ip address. Dynamic ARP Inspection validates IP-MAC matchings.
How do I permit ARP packets that have dynamically assigned IP addresses?
Make sure to enable DHCP snooping to permit ARP packets that have dynamically assigned IP addresses. When DHCP snooping is disabled or in non-DHCP environments, use ARP ACLs to permit or to deny packets.
How does Dai check ARP packets?
DAI checks all ARP packets on untrusted interfaces, it will compare the information in the ARP packet with the DHCP snooping database and/or an ARP access-list. If the information in the ARP packet doesn’t matter, it will be dropped. In this lesson I’ll show you how to configure DAI. Here’s the topology we will use: