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C
HAPTER
14
LAN
14.1
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 83
LAN Example
The LAN screens can help you manage IP addresses.
14.2
What You Can Do
•
Use the
IP
screen (
Section 14.4 on page 112
) to change the IP address for your NBG.
14.3
What You Need To Know
The actual physical connection determines whether the NBG 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.
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Figure 84
LAN and WAN IP Addresses
The LAN parameters of the NBG 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.
14.3.1
IP Pool Setup
The NBG 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 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.
14.3.2
LAN TCP/IP
The NBG has built-in DHCP server capability that assigns IP addresses and DNS servers to systems
that support DHCP client capability.
14.3.3
IP Alias
IP alias allows you to partition a physical network into different logical networks over the same
Ethernet interface. The NBG supports three logical LAN interfaces via its single physical Ethernet
interface with the NBG itself as the gateway for each LAN network.
14.4
LAN IP Screen
Use this screen to change the IP address for your NBG. Click
Network > LAN > IP
.
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Figure 85
Network > LAN > IP
The following table describes the labels in this screen.
Table 55
Network > LAN > IP
LABEL
DESCRIPTION
IP Address
Type the IP address of your NBG in dotted decimal notation.
IP Subnet Mask
The subnet mask specifies the network number portion of an IP address. Your NBG 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.
Apply
Click
Apply
to save your changes back to the NBG.
Reset
Click
Reset
to begin configuring this screen afresh.
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15
DHCP Server
15.1
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’s LAN as a DHCP
server or disable it. When configured as a server, the NBG 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.
15.2
What You Can Do
•
Use the
General
(
Section 15.3 on page 114
) screen to enable the DHCP server.
•
Use the
Advanced
(
Section 15.4 on page 115
) screen to assign IP addresses on the LAN to
specific individual computers based on their MAC Addresses.
15.3
General Screen
Use this screen to enable the DHCP server. Click
Network
>
DHCP Server
.
The following screen
displays.
Figure 86
Network > DHCP Server > General
The following table describes the labels in this screen.
Table 56
Network > DHCP Server > General
LABEL
DESCRIPTION
Enable DHCP
Server
Select this check box to activate the DHCP for LAN.
IP Pool Starting
Address
This field specifies the first of the contiguous addresses in the IP address pool for LAN.
End Address
This field specifies the last of the contiguous addresses in the IP address pool for LAN.
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15.4
Advanced Screen
This screen allows you to assign IP addresses on the LAN to specific individual computers based on
their MAC addresses. You can also use this screen to configure the DNS server information that the
NBG sends to the DHCP clients.
To change your NBG’s static DHCP settings, click
Network
>
DHCP Server
>
Advanced
. The
following screen displays.
Figure 87
Network > DHCP Server > Advanced
The following table describes the labels in this screen.
Apply
Click
Apply
to save your changes back to the NBG.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 56
Network > DHCP Server > General
(continued)
LABEL
DESCRIPTION
Table 57
Network > DHCP Server > Advanced
LABEL
DESCRIPTION
Add Application Rule
IP Address
Type the LAN IP address based on the MAC address in dotted decimal notation.
MAC Address
Type the MAC address (with colons) you want to assign to your NBG
LAN Static DHCP Table
#
This is the index number of the static IP table entry (row).
IP Address
Type the LAN IP address of a computer on your LAN.
MAC Address
Type the MAC address (with colons) of a computer on your LAN.
Modify
Click the
Edit
icon to open the edit screen where you can modify an IP address.
Click the
Delete
icon to remove an IP address.
DNS Server
19216811.live