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- <H1><A NAME="_wmh1_827796637">DHCP</A></H1>
- <P>
- The dynamic host configuration protocol (DHCP) is a service that
- automatically assigns a network address and other operating parameters
- to client hosts that request them. The DHCP service is implemented by
- the <VAR>dhcp_bootp</VAR> process, which runs on a server. The
- configuration parameters that a DHCP server provides clients are stored
- in files that are contained in the <VAR>/var/dhcp/config</VAR>
- directory on the server. This directory contains a file for each
- network for which the DHCP server provides client configuration
- information (see the dhcp_bootp reference page for details).
- </P>
- <P>
- For clients on remote networks (any network to which the DHCP server is
- not directly attached), <VAR>dhcp_bootp</VAR> is assisted by a
- forwarding agent, <VAR>dhcp_relay.</VAR> You run <VAR>dhcp_relay
- </VAR>instead of <VAR>dhcp_bootp </VAR>on a system on each of these
- networks to forward client configuration requests to the DHCP server
- (see the dhcp_relay reference page for details). The DHCP server, which
- is the central source of Internet addresses for all the networks that
- it serves, maintains a list of assigned addresses in a table that you
- can display to monitor address status.
- </P>
- <P>
- To request configuration information from a DHCP server, the client
- host runs the complementary DHCP client application. When the
- server receives a request (which contains the client's hardware
- address), it forwards the network address and other requested
- configuration parameters to the client. Because client addresses are
- assigned for a specified time interval, they are referred to as
- <EM>address leases</EM>. Leases provided an efficient way of managing
- hosts that only occasionally require an Internet address.
- </P>
- <P>
- When the DHCP server configures a new host, it automatically updates
- the appropriate name and address databases on the server. You provide
- information about your name service (either the local hosts file or
- maps for DNS or NIS) and other DHCP server parameters when you
- configure the DHCP server. Server configuration data is stored in the
- <VAR>/etc/config/dhcp_bootp.options </VAR>file.
- </P>
- <P>
- <STRONG>Note:</STRONG> If you are running the NIS name service, the
- DHCP server must be installed on the primary NIS server. If you are
- running DNS, you must update maps manually (or provide an update
- script).
- </P>
- <P>You can choose whether to configure a machine as a DHCP server or
- a relay agent or a client but you cannot choose more than one of these
- options at a time. Use these forms to manage and configure DHCP: </P>
- <UL>
- <LI><A HREF="index.dhcp1.shtml" TARGET="left">DHCP Server Configuration</A>
- <LI><A HREF="index.dhcp2.shtml" TARGET="left">DHCP Server Options</A>
- <LI><A HREF="index.dhcp3.shtml" TARGET="left">Show Leases Currently Assigned by Server</A>
- <LI><A HREF="index.dhcp4.shtml" TARGET="left">Relay Agent Configuration</A>
- </UL>
- EndOfFile
-