Chapter 15. Address Resolution Protocol (ARP)
Section 3.2.1.) At the advent of the Internet, this mapping was implemented by static tables that maintained the mapping of IP addresses to MAC addresses in each computer. However, this method turned out to be inflexible as the ARPANET grew, and it meant an extremely high cost when changes were necessary. For this reason, RFC 826 introduced the Address Resolution Protocol (ARP) to convert address formats.Though the TCP/IP protocol suite has become the leading standard for almost all computer networks, it is interesting to note that ARP was not designed specifically for mapping between IP and MAC addresses. ARP is a generic protocol that finds a mapping between ordered pairs (P,A) and arbitrary physical addresses, where P is a network-layer protocol and A is an address of this protocol P. At the time at which ARP was developed, different protocols, such as CHAOS and Decnet, had been used in the network layer. The ARP instance of a system can be extended so that the required addresses can be resolved for each of the above combinations, which means that no new protocol is necessary. The most common method to allocate addresses between different layers maps the tuple (Internet Protocol, IP address) to 48-bit MAC addresses.
|
|
لطفا منتظر باشید ...
