An attacker could then flood the LAN with ARP responses, even though no one sent an ARP request.
#What is arpspoof mac
Remember that an ARP cache that contains the mapping of IP addresses to MAC addresses is stored in each system. Hence, any computer can send an ARP reply, and the receiving computer does not have any technique to verify it. These protocols were initially built for functionality, so security was just an afterthought in those days protection was not included. A machine would then fill out its ARP cache by mapping each IP address to a MAC address so that when it needs to send a message, rather than sending an ARP broadcast, it will first check if there’s an entry in its ARP cache. The receiving machine would then cache it and place it in its ARP cache. The appropriate machine would send an ARP response, which contains its MAC address. When a computer sends data across a LAN (local area network to a computer with an IP address of 192.168.1.10, but has no record of the mapping of the IP address to a MAC address, it sends a broadcast message to every computer in that switching context (Layer 2) and basically asks “Who is 192.168.1.10?” The first three octets can be used to identify the manufacturer of the NIC.
Since it is a 48-bit address, it is typically represented as six groups of two hexadecimal digits, usually separated by a colon. A MAC address, sometimes called the hardware address, is a 48-bit globally unique address found in the Network Interface Card (NIC) of a computer. Address Resolution Protocol (ARP) maps MAC addresses to an IP address.
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