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Reference Guide Crestron 3-Series Control Systems

34 • 3-Series Control Systems Reference Guide – DOC. 7150A

Dynamic Host Configuration Protocol (DHCP)

Introduction

Crestron’s 3-Series Control Systems support DHCP (Dynamic Host Configuration

Protocol) in a Windows Server environment.

When using DHCP, a dynamic IP address is automatically assigned to a device on

the network. These IP addresses are called “dynamic” because they are only

temporarily assigned, or leased, to the device. After a certain period of time the

DHCP lease expires and may change. When a device connects to the network (or the

Internet) and its dynamic IP address has expired, the DHCP server assigns it a new

dynamic IP address.

The purpose of DHCP is to let network administrators centrally manage and

automate the assignment of IP addresses in an organization’s network. DHCP greatly

reduces the work necessary to administer a large IP network. Without DHCP, the

administrator has to manually configure the IP address each time a computer is

added to the network or moves to a different location.

DHCP provides integration with a DNS (Domain Name System) service. This

system allows hosts to have both domain name addresses (such as ftp.crestron.com)

and IP addresses (such as 65.206.113.4). The domain name address is easier for

people to remember and is automatically translated into the numerical IP address.

The domain name address (also called the Fully-Qualified Domain Name, or FQDN)

identifies the owner of that address in a hierarchical format: server.organization.type.

For example, ftp.crestron.com identifies the FTP server at Crestron, with “.com”

signifying a commercial organization.

A DNS server, also called a name server, maintains a database containing the host

computers and their corresponding IP addresses. Presented with the domain name

address ftp.crestron.com, for example, the DNS server would return the IP address

65.206.113.4.

Another name-resolution service is WINS (Windows Internet Naming Service).

WINS is used in conjunction with DNS and DHCP in a Windows NT 4.0 Server

environment.

Windows DHCP/DNS Server Configuration

Crestron’s 3-Series Control Systems support DHCP in all Windows Server

environments

In the following configuration requirements, a scope defines the range of IP

addresses for the network. Typically a scope defines a single physical subnet on the

network. Scopes provide the primary way for the DHCP server to manage

distribution and assignment of IP addresses and any related configuration parameters

to clients on the network.

Scope options are client configuration parameters applied specifically to all clients

that obtain a lease within a particular scope. Some commonly used options include

IP addresses for default gateways (routers), WINS servers, and DNS servers.

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