What is the purposes of arp2/21/2023 ![]() ![]() For a while I had a toll-free number of my own calls to that number were automatically redirected to the phone in my office. Although each toll-free number is unique and can be used to contact a person at a particular physical location, the number itself does not convey any direct information about what the actual phone number is. The best analogy I can draw to this two-address phenomenon is that of a toll-free phone number, like the 800- and 888-prefixed numbers in the U.S. ![]() This logical address is called, as you might expect, the "IP address." It turns out that every system on an IP network also has a second address. These addresses must be globally unique no two Ethernet-connected systems may have the same 6-byte hardware address. There are unique hardware MAC addresses associated with each device connected to a physical network like Ethernet. The ARP protocol is just one component of a TCP/IP or UDP/IP stack. A UDP/IP stack was sufficient for my own use of the Internet protocols to keep a satellite gateway's firmware up to date and send logging messages to a control and monitoring station.Ī network protocol stack is internally dependent upon the API of the underlying operating system and network device driver, but otherwise separate from those pieces of software. I don't have to convince you that there's no reason to go to the trouble and expense of including software in ROM that your application doesn't actually require. TCP protocol support is not always required in embedded uses of Internet technologies. The address resolution protocol (ARP) provides a necessary bridge between these two addresses. The address resolution protocol provides a necessary bridge between physical and logical addresses on a TCP/IP network.Įvery system on a TCP/IP network has two addresses, one physical and one logical. ![]()
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