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Page 121 / 292 Scroll up to view Page 116 - 120
NBG-419N User’s Guide
121
C
HAPTER
13
LAN
13.1
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 86
LAN Example
The LAN screens can help you manage IP addresses.
13.2
What You Can Do
•
Use the
IP
screen (
Section 13.4 on page 123
) to change the IP address for your NBG-419N.
•
Use the
IP Alias
screen (
Section 13.5 on page 123
) to have the NBG-419N apply IP alias to
create LAN subnets.
Page 122 / 292
Chapter 13 LAN
NBG-419N User’s Guide
122
13.3
What You Need To Know
The actual physical connection determines whether the NBG-419N 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.
Figure 87
LAN and WAN IP Addresses
The LAN parameters of the NBG-419N 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.
13.3.1
IP Pool Setup
The NBG-419N 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-419N 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.
13.3.2
LAN TCP/IP
The NBG-419N has built-in DHCP server capability that assigns IP addresses and DNS servers to
systems that support DHCP client capability.
13.3.3
IP Alias
IP alias allows you to partition a physical network into different logical networks over the same
Ethernet interface. The NBG-419N supports three logical LAN interfaces via its single physical
Ethernet interface with the NBG-419N itself as the gateway for each LAN network.
Page 123 / 292
Chapter 13 LAN
NBG-419N User’s Guide
123
13.4
LAN IP Screen
Use this screen to change the IP address for your NBG-419N. Click
Network > LAN > IP
.
Figure 88
Network > LAN > IP
The following table describes the labels in this screen.
13.5
IP Alias Screen
Use this screen to have the NBG-419N apply IP alias to create LAN subnets. Click
LAN
IP Alias
.
Figure 89
Network > LAN > IP Alias
The following table describes the labels in this screen.
Table 53
Network > LAN > IP
LABEL
DESCRIPTION
IP Address
Type the IP address of your NBG-419N in dotted decimal notation.
IP Subnet Mask
The subnet mask specifies the network number portion of an IP address. Your
NBG-419N 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-419N.
Apply
Click
Apply
to save your changes back to the NBG-419N.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 54
Network > LAN > IP Alias
LABEL
DESCRIPTION
IP Alias
Check this to enable IP alias.
IP Address
Type the IP alias address of your NBG-419N in dotted decimal notation.
Page 124 / 292
Chapter 13 LAN
NBG-419N User’s Guide
124
IP Subnet Mask
The subnet mask specifies the network number portion of an IP address. Your
NBG-419N 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-419N.
Apply
Click
Apply
to save your changes back to the NBG-419N.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 54
Network > LAN > IP Alias
LABEL
DESCRIPTION
Page 125 / 292
NBG-419N User’s Guide
125
C
HAPTER
14
DHCP Server
14.1
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-419N’s LAN as a
DHCP server or disable it. When configured as a server, the NBG-419N 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.
14.2
What You Can Do
•
Use the
General
(
Section 14.3 on page 125
) screen to enable the DHCP server.
•
Use the
Advanced
(
Section 14.4 on page 126
) screen to assign IP addresses on the LAN to
specific individual computers based on their MAC Addresses.
14.3
General Screen
Use this screen to enable the DHCP server. Click
Network
>
DHCP Server
.
The following screen
displays.
Figure 90
Network > DHCP Server > General
The following table describes the labels in this screen.
Table 55
Network > DHCP Server > General
LABEL
DESCRIPTION
Enable DHCP Server
Enable or Disable DHCP for LAN.
IP Pool Starting
Address
This field specifies the first of the contiguous addresses in the IP address
pool for LAN.
Pool Size
This field specifies the size, or count of the IP address pool for LAN.

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