Subnets - Hitron CGN01A User Manual

Cgn residential cable modem
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
The private network (in routing mode - see
Local Area Network (LAN) and Wireless Local Area Network (WLAN), if
enabled. You are free to assign IP addresses to computers on the LAN and
WLAN manually, or to allow the CGN to assign them automatically via DHCP
(Dynamic Host Configuration Protocol). IANA has reserved the following blocks
of IP addresses to be used for private networks only:
Table 5:
Private IP Address Ranges
FROM...
10.0.0.0
172.16.0.0
192.168.0.0
If you assign addresses manually, they must be within the CGN's LAN subnet.
2.1.2.3

SUBNETS

A subnet (short for sub-network) is, as the name suggests, a separate section of a
network, distinct from the main network of which it is a part. A subnet may contain all
of the computers at one corporate local office, for example, while the main network
includes several offices.
In order to define the extent of a subnet, and to differentiate it from the main network,
a subnet mask is used. This "masks" the part of the IP address that refers to the main
network, leaving the part of the IP address that refers to the sub-network.
Each subnet mask has 32 bits (binary digits), as does each IP address:

A binary value of 1 in the subnet mask indicates that the corresponding bit in the
IP address is part of the main network.

A binary value of 0 in the subnet mask indicates that the corresponding bit in the
IP address is part of the sub-network.
For example, the following table shows the IP address of a computer (192.168.1.1)
expressed in decimal and binary (each cell in the table indicates one octet):
Table 6:
IP Address: Decimal and Binary
192
168
11000000
10101000
28
28
...TO
10.255.255.255
172.31.255.255
192.168.255.255
0
00000000
Version 2.0, February 2012. Copyright
Version 2.0, February 2012. Copyright
HITRON CGN USER'S GUIDE
Routing Mode
on page 31) is your
1
00000001
2012 Hitron Technologies
2012 Hitron Technologies
STATUS

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