ARP is defined in RFC 826.ĪRP has been implemented in many types of networks since it is not an IP-only or Ethernet-only protocol. In computer and device networking, the Address Resolution Protocol (ARP) is the method for finding a host's link layer (hardware) address when only its Internet Layer L-3 Internet Protocol (IP) address is known. The odds are very good that you will never see the MAC addresses for any of your equipment, because the software that helps your devices communicate with a network takes care of matching a Layer 2 MAC address to a Layer 3 logical address. In contrast, Layer 3 addresses, which are most commonly 32-bit Internet Protocol (IP) addresses, are used in internetworking to create a virtual network at the network layer. They are used to implement basic LAN, WLAN, and WAN technologies. Layer 2 addresses, such as IEEE 802 MAC (Media Access Control) addresses, are used for local transmissions between hardware devices that can communicate directly. These two different layers use different types of addresses for different purposes. For the routers that are part of the Internet's main "backbone," this means looking at and forwarding millions of information packages every second.Īs I discussed in my last blog, for end-to-end packet delivery addressing is done at two different layers of the OSI model. That means they know the format of the addresses, how many bytes are in the basic package of data sent out over the network, and how to make sure all the packages reach their destination and get reassembled. Routers are configured to operate with most common network protocols. When sending data end-to-end through a network, routers are used in internetworking to create a virtual network from one device to another, either locally or globally.
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