The invention provides a medium /
media access control (MAC) address conflict detection method, which comprises that: before accessing a network, local network equipment transmits a
MAC address conflict detection request message to a destination
multicast address, wherein the request message carries a current
MAC address of the network equipment; destination network equipment receiving the request message extracts the
MAC address from the message request, detects the MAC address, and when judging that the extracted MAC address is the same as own MAC address, transmits a MAC address conflict detection response message to a requesting
multicast address; and the local network equipment receiving the response message generates a new MAC address. The invention also discloses a MAC address conflict detection device and a MAC address conflict detection
system. By the method, the device and the
system, the occurrence of MAC address conflicts can be effectively avoided, the network equipment can be ensured to access the network normally, normal
network service can be provided for a user, and risks in network attacks can be reduced.