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C

HAPTER

6

Home Networking

6.1

Overview

A Local Area Network (LAN) is a shared communication system to which many networking devices

are connected. It is usually located in one immediate area such as a building or floor of a building.

Use the LAN screens to help you configure a LAN DHCP server and manage IP addresses.

6.1.1

What You Can Do in the LAN Screens

•

Use the

LAN Setup

screen to set the LAN IP address, subnet mask, and DHCP settings of your

Device (

Section 6.2 on page 79

).

•

Use the

Static DHCP

screen to assign IP addresses on the LAN to specific individual computers

based on their MAC Addresses (

Section 6.3 on page 81

).

•

Use the

IP Alias

screen (

Section 6.6 on page 84

) to change your Device’s IP alias settings.

•

Use the

UPnP

screen to enable UPnP and UPnP NAT traversal on the Device (

Section 6.5 on page

83

).

•

Use the

IPv6 LAN Setup

screen (

Section 6.6 on page 84

) to configure the IPv6 settings on your

Device’s LAN interface.

•

Use the

File Sharing

screen (

Section 6.7 on page 88

) to set up file sharing via the Device.

•

Use the

Print Server

screen (

Section 6.8 on page 91

) to enable the print server function on the

Device.

DSL

LAN

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6.1.2

What You Need To Know

6.1.2.1

About LAN

IP Address

IP addresses identify individual devices on a network. Every networking device (including

computers, servers, routers, printers, etc.) needs an IP address to communicate across the

network. These networking devices are also known as hosts.

Subnet Mask

Subnet masks determine the maximum number of possible hosts on a network. You can also use

subnet masks to divide one network into multiple sub-networks.

DHCP

A DHCP (Dynamic Host Configuration Protocol) server can assign your Device an IP address, subnet

mask, DNS and other routing information when it's turned on.

DNS

DNS (Domain Name System) is for mapping a domain name to its corresponding IP address and

vice versa. The DNS server is extremely important because without it, you must know the IP

address of a networking device before you can access it.

6.1.2.2

About UPnP

Identifying UPnP Devices

UPnP hardware is identified as an icon in the Network Connections folder (Windows XP). Each UPnP

compatible device installed on your network will appear as a separate icon. Selecting the icon of a

UPnP device will allow you to access the information and properties of that device.

NAT Traversal

UPnP NAT traversal automates the process of allowing an application to operate through NAT. UPnP

network devices can automatically configure network addressing, announce their presence in the

network to other UPnP devices and enable exchange of simple product and service descriptions.

NAT traversal allows the following:

•

Dynamic port mapping

•

Learning public IP addresses

•

Assigning lease times to mappings

Windows Messenger is an example of an application that supports NAT traversal and UPnP.

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Cautions with UPnP

The automated nature of NAT traversal applications in establishing their own services and opening

firewall ports may present network security issues. Network information and configuration may also

be obtained and modified by users in some network environments.

When a UPnP device joins a network, it announces its presence with a multicast message. For

security reasons, the Device allows multicast messages on the LAN only.

All UPnP-enabled devices may communicate freely with each other without additional configuration.

Disable UPnP if this is not your intention.

Finding Out More

See

Section 6.11 on page 103

for technical background information on LANs.

6.1.3

Before You Begin

Find out the MAC addresses of your network devices if you intend to add them to the DHCP Client

List screen.

6.2

The LAN Setup Screen

Use this screen to set the Local Area Network IP address, subnet mask and advanced networking

settings such as RIP, multicast of your Device. Click

Network Setting > Home Networking

to

open the

LAN Setup

screen.

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Figure 40

Network Setting > Home Networking > LAN Setup

The following table describes the fields in this screen.

Table 21

Network Setting > Home Networking > LAN Setup

LABEL

DESCRIPTION

LAN IP Setup

IP Address

Enter the LAN IP address you want to assign to your Device in dotted decimal

notation, for example, 192.168.1.254 (factory default).

Subnet Mask

Type the subnet mask of your network in dotted decimal notation, for example

255.255.255.0 (factory default). Your Device automatically computes the subnet mask

based on the IP Address you enter, so do not change this field unless you are

instructed to do so.

RIP Version

RIP (Routing Information Protocol) allows a router to exchange routing information

with other routers. Select the RIP version from

RIP1

and

RIP2-B/RIP2-M

.

Direction

Use this field to control how much routing information the VDSL Router sends and

receives on the subnet. Select the

RIP Direction

from

None

,

Both

,

IN Only

and

OUT Only

.

Multicast

IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish

membership in a multicast group. The Device supports

IGMP v1/IGMP v2/IGMP

v3

. Select

None

to disable it.

IGMP Snooping

Select

Enabled

to activate IGMP Snooping. This allows the Device to passively learn

memberships in multicast groups. Otherwise, select

Disabled

to deactivate it.

DHCP Server State