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Page 91 / 252 Scroll up to view Page 86 - 90
NBG5715 User’s Guide
91
C
HAPTER
12
LAN
12.1
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 54
LAN Example
The LAN screens can help you manage IP addresses.
12.2
What You Can Do in this Chapter
•
Use the
IP
screen to change the IP address for your NBG5715 (
Section 12.4 on page 92
).
•
Use the
IP Alias
screen to have the NBG5715 apply IP alias to create LAN subnets (
Section 12.5
on page 93
).
12.3
What You Need To Know
The actual physical connection determines whether the NBG5715 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 92 / 252
Chapter 12 LAN
NBG5715 User’s Guide
92
Figure 55
LAN and WAN IP Addresses
The LAN parameters of the NBG5715 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.
12.3.1
IP Pool Setup
The NBG5715 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 NBG5715 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.
12.3.2
LAN TCP/IP
The NBG5715 has built-in DHCP server capability that assigns IP addresses and DNS servers to
systems that support DHCP client capability.
12.4
The LAN IP Screen
Use this screen to change the IP address for your NBG5715. Click
Network > LAN > IP
.
Figure 56
Network > LAN > IP
Page 93 / 252
Chapter 12 LAN
NBG5715 User’s Guide
93
The following table describes the labels in this screen.
12.5
The IP Alias Screen
IP alias allows you to partition a physical network into different logical networks over the same
Ethernet interface. The NBG5715 supports three logical LAN interfaces via its single physical
Ethernet interface with the NBG5715 itself as the gateway for each LAN network.
To change your NBG5715’s IP alias settings, click
Network > LAN
IP Alias
. The screen appears
as shown.
Figure 57
Network > LAN > IP Alias
The following table describes the labels in this screen.
Table 39
Network > LAN > IP
LABEL
DESCRIPTION
IP Address
Type the IP address of your NBG5715 in dotted decimal notation.
IP Subnet Mask
The subnet mask specifies the network number portion of an IP address. Your
NBG5715 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 NBG5715.
Apply
Click
Apply
to save your changes back to the NBG5715.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 40
Network > LAN > IP Alias
LABEL
DESCRIPTION
IP Alias 1, 2
Select the check box to configure another LAN network for the NBG5715.
IP Address
Type the IP alias address of your NBG5715 in dotted decimal notation.
IP Subnet Mask
The subnet mask specifies the network number portion of an IP address. Your
NBG5715 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 NBG5715.
Apply
Click
Apply
to save your changes back to the NBG5715.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Page 94 / 252
Chapter 12 LAN
NBG5715 User’s Guide
94
Page 95 / 252
NBG5715 User’s Guide
95
C
HAPTER
13
DHCP Server
13.1
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 NBG5715’s LAN as a
DHCP server or disable it. When configured as a server, the NBG5715 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.
13.1.1
What You Can Do in this Chapter
•
Use the
General
screen to enable the DHCP server (
Section 13.2 on page 95
).
•
Use the
Advanced
screen to assign IP addresses on the LAN to specific individual computers
based on their MAC Addresses (
Section 13.3 on page 96
).
•
Use the
Client List
screen to view the current DHCP client information (
Section 13.4 on page
97
).
13.1.2
What You Need To Know
The following terms and concepts may help as you read through this chapter.
MAC Addresses
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 Client List
screen.
13.2
The DHCP Server General Screen
Use this screen to enable the DHCP server. Click
Network
>
DHCP Server
.
The following screen
displays.
Figure 58
Network > DHCP Server > General

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