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Page 96 / 237 Scroll up to view Page 91 - 95
NBG-418N v2 User’s Guide
96
C
HAPTER
8
LAN
8.1
Overview
This chapter describes how to configure LAN settings.
A Local Area Network (LAN) is a shared communication system to which many computers are
attached. A LAN is a computer network limited to the immediate area, usually the same building or
floor of a building. The LAN screens can help you configure a LAN DHCP server, manage IP
addresses, and partition your physical network into logical networks.
Figure 68
LAN Setup
The LAN screens can help you configure a LAN DHCP server and manage IP addresses.
8.2
What You Need To Know
The actual physical connection determines whether the NBG-418N v2 ports are LAN or WAN ports.
There are two separate IP networks, one inside the LAN network and the other outside the WAN
network as shown next.
Page 97 / 237
Chapter 8 LAN
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97
Figure 69
LAN and WAN IP Addresses
The LAN parameters of the NBG-418N v2 are preset in the factory with the following values:
•
IP address of 192.168.1.1 with subnet mask of 255.255.255.0 (24 bits)
•
DHCP server enabled with 32 client IP addresses starting from 192.168.1.33.
These parameters should work for the majority of installations. If your ISP gives you explicit DNS
server address(es), read the embedded Web Configurator help regarding what fields need to be
configured.
8.2.1
IP Address and Subnet Mask
Similar to the way houses on a street share a common street name, so too do computers on a LAN
share one common network number.
Where you obtain your network number depends on your particular situation. If the ISP or your
network administrator assigns you a block of registered IP addresses, follow their instructions in
selecting the IP addresses and the subnet mask.
If the ISP did not explicitly give you an IP network number, then most likely you have a single user
account and the ISP will assign you a dynamic IP address when the connection is established. The
Internet Assigned Number Authority (IANA) reserved this block of addresses specifically for private
use; please do not use any other number unless you are told otherwise. Let's say you select
192.168.1.0 as the network number; which covers 254 individual addresses, from 192.168.1.1 to
192.168.1.254 (zero and 255 are reserved). In other words, the first three numbers specify the
network number while the last number identifies an individual computer on that network.
Once you have decided on the network number, pick an IP address that is easy to remember, for
instance, 192.168.1.1, for your NBG-418N v2, but make sure that no other device on your network
is using that IP address.
The subnet mask specifies the network number portion of an IP address. Your NBG-418N v2 will
compute the subnet mask automatically based on the IP address that you entered. You don't need
to change the subnet mask computed by the NBG-418N v2 unless you are instructed to do
otherwise.
8.2.2
DNS Server Address Assignment
Use DNS (Domain Name System) to map a domain name to its corresponding IP address and vice
versa, for instance, the IP address of www.zyxel.com is 204.217.0.2. The DNS server is extremely
Page 98 / 237
Chapter 8 LAN
NBG-418N v2 User’s Guide
98
important because without it, you must know the IP address of a computer before you can access
it.
The NBG-418N v2 can get the DNS server addresses in the following ways.
1
The ISP tells you the DNS server addresses, usually in the form of an information sheet, when you
sign up. If your ISP gives you DNS server addresses, enter them in the
DNS Server
fields in the
Wizard
and/or
WAN
> Internet Connection
screen.
2
If the ISP did not give you DNS server information, leave the
DNS Server
fields set to
0.0.0.0
in
the
Wizard
screen and/or set to
From ISP
in the
WAN
> Internet Connection
screen for the
ISP to dynamically assign the DNS server IP addresses.
8.2.3
IP Pool Setup
The NBG-418N v2 is pre-configured with a pool of 32 IP addresses starting from 192.168.1.33 to
192.168.1.64. This configuration leaves 31 IP addresses (excluding the NBG-418N v2 itself) in the
lower range (192.168.1.2 to 192.168.1.32) for other server computers, for instance, servers for
mail, FTP, TFTP, web, etc., that you may have.
8.2.4
LAN TCP/IP
The NBG-418N v2 has built-in DHCP server capability that assigns IP addresses and DNS servers to
systems that support DHCP client capability.
8.3
LAN IP Screen
Use this screen to change your basic LAN settings. Click
Network
>
LAN
.
Figure 70
Network > LAN > IP
The following table describes the labels in this screen.
Table 43
Network > LAN > IP
LABEL
DESCRIPTION
IP Address
Type the IP address of your NBG-418N v2 in dotted decimal notation 192.168.1.1
(factory default).
IP Subnet Mask
The subnet mask specifies the network number portion of an IP address. Your NBG-
418N v2 will automatically calculate the subnet mask based on the IP address that you
assign. Unless you are implementing subnetting, use the subnet mask computed by the
NBG-418N v2.
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Chapter 8 LAN
NBG-418N v2 User’s Guide
99
Apply
Click
Apply
to save your changes back to the NBG-418N v2.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 43
Network > LAN > IP (continued)
LABEL
DESCRIPTION
Page 100 / 237
NBG-418N v2 User’s Guide
100
C
HAPTER
9
DHCP Server
9.1
Overview
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual clients to
obtain TCP/IP configuration at start-up from a server. You can configure the NBG-418N v2’s LAN as
a DHCP server or disable it. When configured as a server, the NBG-418N v2 provides the TCP/IP
configuration for the clients. If DHCP service is disabled, you must have another DHCP server on
your LAN, or else the computer must be manually configured.
9.2
What You Can Do
•
Use the
General
screen to enable the DHCP server (
Section 9.4 on page 100
).
•
Use the
Static DHCP
screen to assign IP addresses on the LAN to specific individual computers
based on their MAC Addresses (
Section 9.5 on page 101
).
•
Use the
Client List
screen to view the current DHCP client information (
Section 9.6 on page
102
).
9.3
What You Need To Know
Every Ethernet device has a unique MAC (Media Access Control) address. The MAC address is
assigned at the factory and consists of six pairs of hexadecimal characters, for example,
00:A0:C5:00:00:02. Find out the MAC addresses of your network devices if you intend to add them
to the
DHCP Server > Client List
screen.
Refer to
Section 8.2.1 on page 97
for information on IP Address and Subnet Mask.
Refer to the
Section 8.2.2 on page 97
section for information on System DNS Servers.
9.4
General Screen
Use this screen to enable the DHCP server. Click
Network
>
DHCP Server
.
The following screen
displays.

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