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Table 36: DHCP Terms
DefinitionTerm
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.
binding
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.
conflict
Host that uses DHCP to obtain an IP address and configuration settings.DHCP client
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 options
Host that provides an IP address and configuration settings to a DHCP client. The Services Router
is a DHCP server.
DHCP server
Configuration management protocol you can use to supervise and automatically distribute IP
addresses and deliver configuration settings to client hosts from a central DHCP server. An
extension of BOOTP, DHCP is defined in RFC 2131, Dynamic Host Configuration Protocol (DHCP).
Dynamic Host
Configuration Protocol
(DHCP)
Router that passes DHCP messages between DHCP clients and DHCP servers. A gateway router
is sometimes referred to as a relay agent.
gateway router
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.
IP address pool
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).
lease
IP address to which a DHCP client can transmit router solicitation requests.router solicitation address
Server running the Microsoft Windows name resolution service for network basic input/output
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.
Windows Name Service
(WINS) server
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
J-series™ Services Router Administration Guide