Dhcp; Dhcp Lease - Hitron CGN User Manual

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.
3.1.3

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 CGN 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 CGN is a DHCP server on the LAN; it provides IP addresses
to computers on the LAN which request them.
3.1.4

DHCP LEASE

"DHCP lease" refers to the length of time for which a DHCP server allows a DHCP
client to use an IP address. Usually, a DHCP client will request a DHCP lease
renewal before the lease time is up, and can continue to use the IP address for an
additional period. However, if the client does not request a renewal, the DHCP server
stops allowing the client to use the IP address.
This is done to prevent IP addresses from being used up by computers that no longer
require them, since the pool of available IP addresses is finite.
32 32
HITRON CGN USER'S GUIDE
on page 20
Version 2.0, February 2012. Copyright
Version 2.0, February 2012. Copyright
for more information.
2012 Hitron Technologies
2012 Hitron Technologies