ARPANET leader The control information on an ARPANET message at the host-IMP interface.
ARPANET message The unit of transmission between a host and an IMP in the ARPANET. The maximum size is about 1012 octets (8096 bits).
ARPANET packet A unit of transmission used internally in the ARPANET between IMPs. The maximum size is about 126 octets (1008 bits).
Destination The destination address, an internet header field.
DF The Don't Fragment bit carried in the flags field.
Flags An internet header field carrying various control flags.
Fragment Offset This internet header field indicates where in the internet datagram a fragment belongs.
GGP Gateway to Gateway Protocol, the protocol used primarily between gateways to control routing and other gateway functions.
header Control information at the beginning of a message, segment, datagram, packet or block of data.
ICMP Internet Control Message Protocol, implemented in the internet module, the ICMP is used from gateways to hosts and between hosts to report errors and make routing suggestions.
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Identification An internet header field carrying the identifying value assigned by the sender to aid in assembling the fragments of a datagram.
IHL The internet header field Internet Header Length is the length of the internet header measured in 32 bit words.
IMP The Interface Message Processor, the packet switch of the ARPANET.
Internet Address A four octet (32 bit) source or destination address consisting of a Network field and a Local Address field.
internet datagram The unit of data exchanged between a pair of internet modules (includes the internet header).
internet fragment A portion of the data of an internet datagram with an internet header.
Local Address The address of a host within a network. The actual mapping of an internet local address on to the host addresses in a network is quite general, allowing for many to one mappings.
MF The More-Fragments Flag carried in the internet header flags field.
module An implementation, usually in software, of a protocol or other procedure.
more-fragments flag A flag indicating whether or not this internet datagram contains the end of an internet datagram, carried in the internet header Flags field.
NFB The Number of Fragment Blocks in a the data portion of an internet fragment. That is, the length of a portion of data measured in 8 octet units.
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octet An eight bit byte.
Options The internet header Options field may contain several options, and each option may be several octets in length.
Padding The internet header Padding field is used to ensure that the
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