Dhcp; Table 7: Subnet Mask: Decimal And Binary - Hitron CGN2 User Manual

The following table shows a subnet mask that "masks" the first twenty-four bits of the
IP address, in both its decimal and binary notation.
Table 7: Subnet Mask: Decimal and Binary
255 255
11111111 11111111
This shows that in this subnet, the first three octets (192.168.1, in the example IP
address) define the main network, and the final octet (1, in the example IP address)
defines the computer's address on the subnet.
The decimal and binary notations give us the two common ways to write a subnet
mask:
Decimal: the subnet mask is written in the same fashion as the IP address:

255.255.255.0, for example.
Binary: the subnet mask is indicated after the IP address (preceded by a forward

slash), specifying the number of binary digits that it masks. The subnet mask
255.255.255.0 masks the first twenty-four bits of the IP address, so it would be
written as follows: 192.168.1.1/24.
2.1.3

DHCP

The Dynamic Host Configuration Protocol, or DHCP, defines the process by which IP
addresses can be assigned to computers and other networking devices
automatically, from another device on the network. This device is known as a DHCP
server, and provides addresses to all the DHCP client devices.
In order to receive an IP address via DHCP, a computer must first request one from
the DHCP server (this is a broadcast request, meaning that it is sent out to the whole
network, rather than just one IP address). The DHCP server hears the requests, and
responds by assigning an IP address to the computer that requested it.
If a computer is not configured to request an IP address via DHCP, you must
configure an IP address manually if you want to access other computers and devices
on the network. See IP Address Setup
By default, the CGN2 is a DHCP client on the WAN (the CATV connection). It
broadcasts an IP address over the cable network, and receives one from the service
provider. By default, the CGN2 is a DHCP server on the LAN; it provides IP
addresses to computers on the LAN which request them.
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HITRON CGN2 USER'S GUIDE
255
11111111
on page 21
Version 2.0, February 2012. Copyright
Version 2.0, February 2012. Copyright
0
00000000
for more information.
2012 Hitron Technologies
2012 Hitron Technologies