ARP spoofing or ARP cache poisoning is the process of mapping multiple IP addresses to a single MAC address. Attackers frequently use this technique to intercept network traffic or launch a man-in-the-middle attack. There are legitimate reasons for mapping multiple IP addresses to a single MAC address, such as load balancing or redundancy.
Steps to Map Multiple IP Addresses to a Single MAC Address:
- Discover the MAC address of the device for which you want to allocate an IP address. You can accomplish by running the "arp -a" command on a PC running Windows or the "arp" command on a Linux machine.
- To spoof the ARP cache of network devices, use a programme like arpspoof or Ettercap. These tools enable you to send bogus ARP messages to network devices, which will update their ARP caches with the faked MAC address.
- In the ARP messages, deliver the MAC address for which an IP address must be mapped, in addition to the IP addresses to which they should be mapped. For example, if you wish to map the IP addresses 192.168.1.100 and 192.168.1.101 to the MAC address 00:11:22:33:44:55, send the following ARP messages:-
- After the network devices' ARP caches have been updated, they will transmit network traffic to the device with the faked MAC address.. The gadget may then evaluate the network traffic and respond appropriately.
ARP spoofing can be a security risk because it allows attackers to intercept network traffic and launch attacks. If you're using ARP spoofing for legitimate purposes, make sure you're doing therefore in a controlled environment with sufficient security measures.