Private Ipv4 Address Ranges; Reserved Host Addresses; Default Gateway; Domain Name System (Dns) - Distech Controls ECLYPSE ECY-STAT User Manual

Private IPv4 Address Ranges

Each IP address class has a private address range. Private IPv4 addresses cannot be routed over the
Internet.
ECY-STAT controllers will normally be assigned to a private IP address and are connected to the LAN
ports of a router, thereby keeping them behind a firewall from the internet while allowing them to freely
communicate to each other and to other trusted devices.
The following IPv4 address ranges are reserved for private networks.
Network Class IP Address Range
A 10.0.0.0 - 10.255.255.255
B 172.16.0.0 - 172.31.255.255
C 192.168.0.0 - 192.168.255.255
For security reasons, IPv4 addresses should be selected from the IP address ranges given in the table above.

Reserved Host Addresses

The first and the last IP addresses are reserved for special use on all subnetwork IP address ranges:
The first IP Address is the Network ID. Networks with different network IDs are considered to be dis-
tinct. By default, no direct communication can take place between two networks that have different
Network IDs. This prevents computers on one network from being accessed by computers on another
network. When one department or organization is on one network, it is segregated from computers on
other networks.
Last IP Address is the Broadcast Address: this is used for a specific type of network traffic that is des-
tined to every host in the subnetwork range of IP addresses. For example, the device's DHCP client
uses the broadcast address to find the network's DHCP server.
For Example, with a typical class C private network:
Subnetwork Mask = 255.255.255.0
Network ID = 192.168.1.0
Gateway = 192.168.1.1
Broadcast Address = 192.168.1.255
Usable IP Addresses = 192.168.1.2 - 192.168.1.254

Default Gateway

Two hosts on the same subnetwork can directly communicate with each other. When a host wants to
communicate to an IP address that is not in the subnetwork address range, the host sends the packet
to the default gateway. The default gateway is usually the router's IP address and is usually set in the
routers administration interface. For more information about IP routing, see
and Hubs.
Certain ECY-STAT services use the default gateway.

Domain Name System (DNS)

When you want to connect to another computer or service on the Internet (to a Website for example),
rarely would you want to use the IP address to make the connection as it would be a pain to remem-
ber the numeric IP address for each and every site you want to visit. The Domain Name System
(DNS) was created to allow internet users to take advantage of a meaningful Uniform Resource Loca-
http://www.distech-controls.com/
tor (URL) such as
the server's or computer's numerical IP address. The DNS does this by looking up the URL and pro-
viding the numeric IP address to the requesting computer. Should the IP address of a computer/server
be changed, the DNS server can be updated with its new IP address, thereby ensuring that other net-
worked computers can still find this computer/server through its URL.
ECLYPSE Connected Thermostat (ECY-STAT)
IPv4 Communication Fundamentals
Number of Addresses Largest CIDR Block (subnetwork mask)
16,777,216 10.0.0.0/8 (255.0.0.0)
1,048,576 172.16.0.0/12 (255.240.0.0)
65,536 192.168.0.0/16 (255.255.0.0)
to connect to an IP address without having to know
About Routers, Switches,
15