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MAC Address

The physical identifier of a network interface used mainly on the local network

TopicIT knowledge → About 1 min read

Simple definition

The MAC address identifies an Ethernet or Wi-Fi network card on the local network.

Technical definition

A MAC address is commonly a 48-bit link-layer identifier. Ethernet switches learn source MAC addresses on their ports and use their forwarding tables to deliver frames on the local network.

What’s the point?. ?

Identify an interface on the LAN, reserve a DHCP address or diagnose the path of a frame.

Concrete example.

The DHCP server recognizes the printer’s MAC address and always assigns the same IP address to the printer.

Common problems.

  • Random MAC address on mobile devices
  • Table Mac of the Saturated or Incorrect Switch
  • Confusion between address(s) and IP address(s).
  • Easily aroundable Mac filtering

Note: Exact settings and behavior depend on the product, software version and network environment.

Related resources

Relevant topic IP Address a logical address that identifies an interface or equipment on a network using IP protocol Relevant topic DHCP DHCP automatically assigns IP addresses and other network settings to client devices, usually for a defined lease p... Relevant topic Switch Equipment that connects devices to a local network and transmits frames according to their addresses. Relevant topic LAN Local network connecting the equipment of a home, office or site. Relevant topic Wi-Fi Wireless LAN technology based on IEEE 802.11.
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