TCP/IPv6 Migration Guide

Glossary
HP NonStop TCP/IPv6 Migration Guide—524524-004
Glossary-3
Class D
INTERNET get their subnet class from the DCA's NIC (Network Information Center).
The address classes of standalone, or entirely private, LANs are administered by the
LAN administrator. Typical usage calls for all CLASS A addresses to have private
LANs.
Class D. A Class D address is a 4-octet multicast group address. The four high-order bits of
the address are always 1110; therefore, the first octet is a number in the range 224
through 239 (%HE0 through %HEF). This means that an Internet can have a total of
268,435,456 multicast groups.
collector. An EMS process that accepts event messages from subsystems and logs them in
the event log. See also Event Management Service (EMS). Compare distributor.
command message. A SPI message, containing a command, sent from an application
program to a subsystem. See also SPI message. Compare response message or
event message.
common definition. In DSM programmatic interfaces, a definition (data declaration) used in
several commands, responses, or event messages in an SPI interface to a subsystem.
See also definition.
compatibility distributor. An EMS distributor process that filters event messages
according to fixed (rather than user-specified) criteria, obtains text for these messages
that is compatible with the operator console of Guardian operating system versions
earlier than C00, and writes the text to the standard Guardian console-message
destinations. See also distributor.
conditional token. In DSM event management, a token that is sometimes, but not always,
present in a particular event message.
configured tunneling. IPv6-over-IPv4 tunneling where the IPv4 tunnel endpoint address is
determined by configuration information on the encapsulating node. The tunnels can
be either unidirectional or bidirectional. Bidirectional tunnels behave as virtual point-to-
point links.
connection. The path between two protocol modules that provides reliable stream delivery
service. In the Internet, a connection extends from a TCP module on one machine to a
TCP module on another machine.
connectionless service. Characteristic of the packet delivery service offered by most
hardware and by the Internet Protocol (IP). The connectionless service treats each
packet or datagram as a separate entity that contains the source and destination
address. Usually, connectionless services can drop packets or deliver them out of
sequence.
consumer distributor. An EMS distributor process that returns selected event messages to
management applications upon request. See also distributor.