Crestron e-Control, Справочное руководство

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Software Crestron e-Control
®
DHCP provides integration with a DNS ( D omain N ame S ystem) 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 F ully- Q ualified D omain N ame, 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 ( W indows I nternet N aming S ervice).
WINS is used in conjunction with DNS and DHCP in a Windows NT 4.0 Server
environment.
Crestron’s 2-Series control systems and TPS touchpanels support DHCP in a
Windows 2000 Server or Windows NT 4.0 Server environment.
Obtaining IP Information
If you are setting up a residential LAN, you must obtain the IP address and other IP
configuration information for the WAN side of the router from the ISP. You would
then use the router’s network configuration screens to define the range of static IP
addresses available on the LAN side.
If you are installing e-Control in a corporate LAN, the network administrator must
provide you with static IP addresses if you are configuring X-Series and CEN
equipment. In addition to the static IP address of each device, the network
administrator will give you the subnet mask and default gateway address of the
network.
For 2-Series control systems and TPS touchpanels, you can configure the equipment
to accept dynamic IP addresses from the Windows DHCP Server.
If you are using the NAT on the C2ENET-2 card, you can configure the LAN A side
for static or dynamic IP addressing. Then you can assign static IP addresses for
devices on the LAN B side, using the range of private IP addresses.
Port Numbers
Any server machine makes its services available to the Internet using numbered
ports , one for each service. For example, if a server machine is running a Web server
and an FTP server, the Web server would typically be available on port 80, and the
FTP server would be available on port 21. Clients connect to a service at a specific IP
address
and on a specific port number. There are 65,535 port numbers available for
use with TCP, and the same number is available for UDP.
The port numbers are divided into three ranges: the Well Known Ports, the
Registered Ports, and the Dynamic and/or Private Ports.
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The Well Known Ports are those from 0 through 1023.
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Crestron e-Control® Reference Guide – DOC. 6052