NEC SL1100, Networking Manual

Page: 28 / 292

Issue 6.0 NEC SL1100
4 - 2 General IP Configuration
S
ECTION
2
N
ETWORK
A
DDRESSING
O
VERVIEW
Before connecting the system to a data network, it is necessary to obtain the relevant
IP Addressing information. This information is supplied by the IT Manager or Network
Administrator at the customer site.
2.1 IP Address
All equipment/devices used in the LAN setup must have an IP address
assignment. An IP address assigns a unique address for each device. There
are two types of IP addresses: Private and Global. A Private IP address is not
accessible through the Internet; a Global IP address can be accessed through
the Internet.
In most cases, a Private address is used, as LAN devices are not usually
directly connected to the Internet. Private addresses are usually taken from
the following ranges:

Class A 10.0.0.0 ~ 10.255.255.255

Class B 172.16.0.0. ~ 172.31.255.255

Class C 192.168.0.0 ~ 192.168.255.255
A Public address is normally only used when a device is directly connected to
the Internet. This is unlikely in the case of the equipment. If Public addressing
is used, the numbers are normally allocated by an ISP.
2.2 Subnet Mask
As the IP address includes information to identify both the network and the
final destination, the Subnet Mask sets apart the network and destination
information. The default subnet masks are:

Class A 255.0.0.0

Class B 255.255.0.0

Class C 255.255.255.0
The Subnet Mask is made up of four groups of numbers. When a group
contains the number
255 , the router ignores or masks that group of numbers
in the IP address as it is defining the network location of the final destination.