DHCP Terms

Before configuring the DHCP server on J Series or SRX Series device, become familiar with the terms defined in Table 36.

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 J Series or SRX Series device is a DHCP server.
Dynamic Host Configuration Protocol (DHCP)	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).
gateway router	Device 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 (WINS) server	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.