Juniper Networks J-Series manual Dhcp Overview, Dhcp Terms

J-series™ Services Router Administration Guide

Table 36: DHCP Terms

Term	Definition
binding	Collection of configuration parameters, including at least an IP address, assigned by a DHCP
	server to a DHCP client. A binding can be dynamic (temporary) or static (permanent). Bindings
	are stored in the DHCP server's binding database.
conflict	Problem that occurs when an address within the IP address pool is being used by a host that
	does not have an associated binding in the DHCP server's database. Addresses with conflicts
	are removed from the pool and logged in a conflicts list until you clear the list.
DHCP client	Host that uses DHCP to obtain an IP address and configuration settings.
DHCP options	Configuration settings sent within a DHCP message from a DHCP server to a DHCP client. For
	a list of DHCP options, see RFC 2132, DHCP Options and BOOTP Vendor Extensions.
DHCP server	Host that provides an IP address and configuration settings to a DHCP client. The Services Router
	is a DHCP server.
Dynamic Host	Configuration management protocol you can use to supervise and automatically distribute IP
Configuration Protocol	addresses and deliver configuration settings to client hosts from a central DHCP server. An
(DHCP)	extension of BOOTP, DHCP is defined in RFC 2131, Dynamic Host Configuration Protocol (DHCP).
gateway router	Router that passes DHCP messages between DHCP clients and DHCP servers. A gateway router
	is sometimes referred to as a relay agent.
IP address pool	Collection of IP addresses maintained by the DHCP server for assignment to DHCP clients. The
	address pool is associated with a subnet on either a logical or physical interface.
lease	Period of time during which an IP address is allocated, or bound, to a DHCP client. A lease can
	be temporary (dynamic binding) or permanent (static binding).
router solicitation address	IP address to which a DHCP client can transmit router solicitation requests.
Windows Name Service	Server running the Microsoft Windows name resolution service for network basic input/output
(WINS) server	system (NetBIOS) names. WINS is used by hosts running NetBIOS over TCP/IP (NetBT) to register
	NetBIOS names and to resolve NetBIOS names to IP addresses.

DHCP Overview

DHCP is based on BOOTP, a bootstrap protocol that allows a client to discover its own IP address, the IP address of a server host, and the name of a bootstrap file. DHCP servers can handle requests from BOOTP clients, but provide additional capabilities beyond BOOTP, such as the automatic allocation of reusable IP addresses and additional configuration options.

NOTE: You cannot configure the Services Router as both a DHCP server and a BOOTP relay agent.

DHCP provides two primary functions:

■Allocate temporary or permanent IP addresses to clients.

64■ DHCP Overview