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Page 111 / 296 Scroll up to view Page 106 - 110
NBG334W User’s Guide
111
C
HAPTER
8
LAN
This chapter describes how to configure LAN settings.
8.1
LAN Overview
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.
8.1.1
IP Pool Setup
The NBG334W 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 NBG334W 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.
8.1.2
System DNS Servers
Refer to the IP address and subnet mask section in the
Connection
Wizard
chapter.
8.2
LAN TCP/IP
The NBG334W has built-in DHCP server capability that assigns IP addresses and DNS
servers to systems that support DHCP client capability.
8.2.1
Factory LAN Defaults
The LAN parameters of the NBG334W 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.
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Chapter 8 LAN
NBG334W User’s Guide
112
8.2.2
IP Address and Subnet Mask
Refer to the IP address and subnet mask section in the
Connection
Wizard
chapter for this
information.
8.2.3
Multicast
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1
recipient) or Broadcast (1 sender - everybody on the network). Multicast delivers IP packets to
a group of hosts on the network - not everybody and not just 1.
IGMP (Internet Group Management Protocol) is a network-layer protocol used to establish
membership in a Multicast group - it is not used to carry user data. IGMP version 2 (RFC
2236) is an improvement over version 1 (RFC 1112) but IGMP version 1 is still in wide use. If
you would like to read more detailed information about interoperability between IGMP
version 2 and version 1, please see sections 4 and 5 of RFC 2236. The class D IP address is
used to identify host groups and can be in the range 224.0.0.0 to 239.255.255.255. The address
224.0.0.0 is not assigned to any group and is used by IP multicast computers. The address
224.0.0.1 is used for query messages and is assigned to the permanent group of all IP hosts
(including gateways). All hosts must join the 224.0.0.1 group in order to participate in IGMP.
The address 224.0.0.2 is assigned to the multicast routers group.
The NBG334W supports both IGMP version 1 (
IGMP-v1
) and IGMP version 2 (
IGMP-v2
).
At start up, the NBG334W queries all directly connected networks to gather group
membership. After that, the NBG334W periodically updates this information. IP multicasting
can be enabled/disabled on the NBG334W LAN and/or WAN interfaces in the web
configurator (
LAN
;
WAN
). Select
None
to disable IP multicasting on these interfaces.
8.2.4
Any IP
Traditionally, you must set the IP addresses and the subnet masks of a computer and the
NBG334W to be in the same subnet to allow the computer to access the Internet (through the
NBG334W). In cases where your computer is required to use a static IP address in another
network, you may need to manually configure the network settings of the computer every time
you want to access the Internet via the NBG334W.
With the Any IP feature and NAT enabled, the NBG334W allows a computer to access the
Internet without changing the network settings (such as IP address and subnet mask) of the
computer, when the IP addresses of the computer and the NBG334W are not in the same
subnet. Whether a computer is set to use a dynamic or static (fixed) IP address, you can simply
connect the computer to the NBG334W and access the Internet.
The following figure depicts a scenario where a computer is set to use a static private IP
address in the corporate environment. In a residential house where a NBG334W is installed,
you can still use the computer to access the Internet without changing the network settings,
even when the IP addresses of the computer and the NBG334W are not in the same subnet.
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Chapter 8 LAN
NBG334W User’s Guide
113
Figure 59
Any IP Example
The Any IP feature does not apply to a computer using either a dynamic IP address or a static
IP address that is in the same subnet as the NBG334W’s IP address.
"
You
must
enable NAT to use the Any IP feature on the NBG334W.
Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP
address) to a physical machine address, also known as a Media Access Control or MAC
address, on the local area network. IP routing table is defined on IP Ethernet devices (the
NBG334W) to decide which hop to use,
to help forward data along to its specified destination.
The following lists out the steps taken, when a computer tries to access the Internet for the first
time through the NBG334W.
1
When a computer (which is in a different subnet) first attempts to access the Internet, it
sends packets to its default gateway (which is not the NBG334W) by looking at the
MAC address in its ARP table.
2
When the computer cannot locate the default gateway, an ARP request is broadcast on
the LAN.
3
The NBG334W receives the ARP request and replies to the computer with its own MAC
address.
4
The computer updates the MAC address for the default gateway to the ARP table. Once
the ARP table is updated, the computer is able to access the Internet through the
NBG334W.
5
When the NBG334W receives packets from the computer, it creates an entry in the IP
routing table so it can properly forward packets intended for the computer.
After all the routing information is updated, the computer can access the NBG334W and the
Internet as if it is in the same subnet as the NBG334W.
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Chapter 8 LAN
NBG334W User’s Guide
114
8.3
LAN IP Screen
Use this screen to change your basic LAN settings. Click
Network
>
LAN
.
Figure 60
Network > LAN > IP
The following table describes the labels in this screen.
8.4
LAN IP Alias
IP alias allows you to partition a physical network into different logical networks over the
same Ethernet interface. The NBG334W supports three logical LAN interfaces via its single
physical Ethernet interface with the NBG334W itself as the gateway for each LAN network.
To change your NBG334W’s IP alias settings, click
Network
>
LAN
>
IP Alias
. The screen
appears as shown.
Table 41
Network > LAN > IP
LABEL
DESCRIPTION
LAN TCP/IP
IP Address
Type the IP address of your NBG334W 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
NBG334W 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 NBG334W.
Apply
Click
Apply
to save your changes back to the NBG334W.
Reset
Click
Reset
to begin configuring this screen afresh.
Page 115 / 296
Chapter 8 LAN
NBG334W User’s Guide
115
Figure 61
Network > LAN > IP Alias
The following table describes the labels in this screen.
8.5
Advanced LAN Screen
To change your NBG334W’s advanced IP settings, click
Network
>
LAN
>
Advanced
. The
screen appears as shown.
Figure 62
Network > LAN > Advanced
Table 42
Network > LAN > IP Alias
LABEL
DESCRIPTION
IP Alias 1,2
Select the check box to configure another LAN network for the NBG334W.
IP Address
Enter the IP address of your NBG334W in dotted decimal notation.
IP Subnet Mask
Your NBG334W 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 NBG334W.
Apply
Click
Apply
to save your changes back to the NBG334W.
Reset
Click
Reset
to begin configuring this screen afresh.

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