In the common case this table is for mapping Ethernet to IP addresses. You will often see ARP packets at the beginning of a conversation, as ARP is the way these addresses are discovered.ĪRP can be used for Ethernet and other LANs, ATM, and a lot of other underlying physical addresses (the list of hardware types in the ADDRESS RESOLUTION PROTOCOL PARAMETERS document at the IANA Web site includes at least 33 hardware types).ĪRP is used to dynamically build and maintain a mapping database between link local layer 2 addresses and layer 3 addresses. 192.168.0.10) to the underlying Ethernet address (e.g. A typical use is the mapping of an IP address (e.g. The Address Resolution Protocol is used to dynamically discover the mapping between a layer 3 (protocol) and a layer 2 (hardware) address.
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