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Crestron e-Control

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The private network addresses are as follows:

• Range 1: Class A - 10.0.0.0 through 10.255.255.255

• Range 2: Class B - 172.16.0.0 through 172.31.255.255

• Range 3: Class C - 192.168.0.0 through 192.168.255.255

You are not required to use any particular range when you set up an internal network.

However, Crestron recommends using the private network addresses for e-Control

equipment on an internal LAN, because they greatly reduce the chance of an IP

address conflict.

Another reserved IP address is 127.0.0.1, or localhost. This special address is also

referred to as a loopback address and represents the same computer or device on

which a TCP/IP message originates. Data going to 127.0.0.1 does not actually go out

to the Internet.

Default Gateway

A default gateway is a router that links a subnet, or internal LAN, to outside

networks. When a device attempts to communicate with another device on the same

internal LAN, the data is simply transferred on the local subnet. However, if the

destination is a remote device, then the data has to be forwarded to the default

gateway. It is then the responsibility of the router to forward the data to the correct

subnet.

In cases where data will not be routed outside the internal LAN, the default gateway

address can be set to 0.0.0.0. Otherwise, you would specify the internal LAN address

of the router.

Static and Dynamic IP Addressing

Static and dynamic IP addressing are two different methods of assigning an IP

address to a device.

A static IP address is a fixed IP address that you assign manually to a computer or

network device. It remains valid until it is disabled; static IP addressing thus ensures

that a device will always have the same IP address until it is changed to a different

value.

Crestron’s X-Series control systems and CEN devices require static IP addressing for

use in e-Control.

In contrast, 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 time they expire and may change.

When a device connects to the network (or the Internet) and its dynamic IP address

has expired, the DHCP (Dynamic Host Configuration Protocol) server will assign 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.

Reference Guide – DOC. 6052 Crestron e-Control® • 9

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