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address resolution protocol
(foldoc) | Address Resolution Protocol
ARP
(ARP) A method for finding a host's
Ethernet address from its Internet address. The sender
broadcasts an ARP packet containing the Internet address
of another host and waits for it (or some other host) to send
back its Ethernet address. Each host maintains a cache of
address translations to reduce delay and loading. ARP allows
the Internet address to be independent of the Ethernet address
but it only works if all hosts support it.
ARP is defined in RFC 826.
The alternative for hosts that do not do ARP is {constant
mapping}.
See also proxy ARP, reverse ARP.
(1995-03-20)
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apple address resolution protocol
(foldoc) | Apple Address Resolution Protocol
AARP
(AARP) Apple's system to allow AppleTalk
protocol to work over networks other than LocalTalk, such
as Ethernet or Token Ring. AppleTalk nodes announce
their presence to the network so that other nodes can address
messages to them. AARP maps between AppleTalk addresses and
other schemes. It is actually a general address mapping
protocol that can be used to map between addresses at any
protocol level.
[G. Sidhu, R. Andrews, and A. Oppenheimer, "Inside AppleTalk",
Addison Wesley, 1990].
(2006-04-18)
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inverse address resolution protocol
(foldoc) | Inverse Address Resolution Protocol
InARP
(InARP) Additions to ARP typically
used for Frame Relay. [Any other examples of its use?]
Frame Relay stations route frames of a higher level
protocol between LANs, across a Permanent Virtual Circuit.
These stations are identified by their {Data Link Control
Identifier} (DLCI), equivalent to an Ethernet address in a
LAN itself.
InARP allows a station to determine a protocol address (e.g.
IP address) from a DLCI. This is useful if a new {virtual
circuit} becomes available. Signalling messages announce its
DLCI, but without the corresponding protocol address it is
unusable: no frames can be routed to it.
Reverse ARP (RARP) performs a similar task on an Ethernet
LAN, however RARP answers the question "What is my IP
Address?" whereas InARP answers the question "What is your
protocol address?".
See RFC 2390.
(2000-01-15)
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reverse address resolution protocol
(foldoc) | Reverse Address Resolution Protocol
RARP
Reverse ARP
(RARP) A protocol defined in {RFC
903} which provides the reverse function of ARP. RARP maps
a hardware address (MAC address) to an IP address.
It is used primarily by diskless nodes, when they first
initialise, to find their IP address.
See also BOOTP.
(1994-12-08)
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