Dhcp server configuration, Dhcp overview, Dhcp server – Enterasys Networks Enterasys D2 D2G124-12P User Manual
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D-Series CLI Reference 14-1
14
DHCP Server Configuration
This chapter describes the commands to configure the IPv4 DHCP server functionality on a D‐
Series switch.
DHCP Overview
Dynamic Host Configuration Protocol (DHCP) for IPv4 is a network layer protocol that
implements automatic or manual assignment of IP addresses and other configuration information
to client devices by servers. A DHCP server manages a user‐configured pool of IP addresses from
which it can make assignments upon client requests. A relay agent passes DHCP messages
between clients and servers which are on different physical subnets.
DHCP Server
DHCP server functionality allows the D‐Series switch to provide basic IP configuration
information to a client on the network who requests such information using the DHCP protocol.
DHCP provides the following mechanisms for IP address allocation by a DHCP server:
•
Automatic—DHCP server assigns an IP address to a client for a limited period of time (or
until the client explicitly relinquishes the address) from a defined pool of IP addresses
configured on the server.
•
Manual—A client’s IP address is assigned by the network administrator, and DHCP is used
simply to convey the assigned address to the client. This is managed by means of “static”
address pools configured on the server.
The amount of time that a particular IP address is valid for a system is called a lease. The D‐Series
maintains a lease database which contains information about each assigned IP address, the MAC
address to which it is assigned, the lease expiration, and whether the address assignment is
dynamic (automatic) or static (manual). The DHCP lease database is stored in flash memory.
In addition to assigning IP addresses, the DHCP server can also be configured to assign the
following to requesting clients:
•
Default router(s)
•
DNS server(s) and domain name
•
NetBIOS WINS server(s) and node name
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