This is also called sniffing packets.įor versions of Ethernet that are inherently broadcast, such as a hub, an adversary in the local network can see all network traffic and can also introduce any traffic they desire by simply sending packets with a spoofed MAC address. But this is only enforced in software, and most Ethernet devices can enter promiscuous mode, where it will receive all packets. A receiver is simply supposed to ignore all packets not sent to either the receiver’s MAC or the broadcast address. Each node on the network could see messages sent by all other nodes, either by being on a common wire or a network hub, a simple repeater that took every packet it received and rebroadcast it to all the outputs. Ethernet is one particular LAN implementation that uses wires to connect all machines.Įthernet started as a broadcast-only network. Recall that on a LAN (local-area network), all machines are connected to all other machines. Vulnerability: On-path attackers can see requests and send spoofed malicious responses Purpose: Translate IP addresses to MAC addresses This site uses Just the Docs, a documentation theme for Jekyll.Ģ6.

Arp network mac address broadcast