Zyxel P-870HN-51b Router Manual PDF (Setup & Configuration Guide)

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P-870HN-51b User’s Guide

101

C

HAPTER

6

LAN

Setup

6.1

Overview

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

computers are attached. A LAN is usually located in one immediate area such as a

building or floor of a building.

The LAN screens can help you configure a LAN DHCP server and manage IP

addresses.

•

See

Section 6.5 on page 106

for more information on LANs.

•

See

Appendix D on page 335

for more information on IP addresses and

subnetting.

6.1.1

What You Can Do in this Chapter

• The

LAN IP

screen (

Section 6.4 on page 105

) lets you set the LAN IP address

and subnet mask of your ZyXEL device and configure other LAN TCP/IP settings.

•

Use the

Client List

screen (

Section 6.4 on page 105

) to look at the IP

addresses currently assigned to DHCP clients and the IP addresses reserved for

specific MAC addresses.

Internet

DSL

LAN

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6.2

What You Need To Know

IP Address

Similar to the way houses on a street share a common street name, so too do

computers on a LAN share one common network number. This is known as an

Internet Protocol address.

Subnet Mask

The subnet mask specifies the network number portion of an IP address. Your

Device will compute the subnet mask automatically based on the IP address that

you entered. You don't need to change the subnet mask computed by the Device

unless you are instructed to do otherwise.

DHCP

DHCP (Dynamic Host Configuration Protocol) allows clients to obtain TCP/IP

configuration at start-up from a server. This Device has a built-in DHCP server

capability that assigns IP addresses and DNS servers to systems that support

DHCP client capability.

DHCP Relay

You can also configure the Device to relay client DHCP requests to a DHCP server

and the server’s responses back to the clients.

RIP

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

information with other routers.

Multicast and IGMP

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 Multicast Protocol) is a network-layer protocol used to

establish membership in a Multicast group - it is not used to carry user data.

There are two versions 1 and 2. IGMP version 2 is an improvement over version 1

but IGMP version 1 is still in wide use.

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DNS

DNS (Domain Name System) maps 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 computer before you can access it. The DNS

server addresses you enter when you set up DHCP are passed to the client

machines along with the assigned IP address and subnet mask.

6.3

The LAN IP Screen

Click

Network > LAN > IP

to open the

IP

screen. See

Section 6.5 on page 106

for background information. Use this screen to set the Local Area Network IP

address and subnet mask of your Device.

Figure 47

Network > LAN > IP

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The following table describes the fields in this screen.

Table 23

Network > LAN > IP

LABEL

DESCRIPTION

LAN TCP/IP

Group Name

Select the interface group for which you want to configure the LAN

TCP/IP settings. See

Chapter 21 on page 243

for how to create a new

interface group.

IP Address

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

decimal notation, for example, 192.168.1.1 (factory default).

IP Subnet Mask

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

example 255.255.255.0 (factory default).

DHCP Setup

Active DHCP

Select this to have the Device act as a DHCP server or DHCP relay

agent.

Otherwise, deselect this to not have the Device provide any DHCP

services. The DHCP server will be disabled.

DHCP Server

Select this option to have the Device assign IP addresses and provide

subnet mask, gateway, and DNS server information to the network.

The Device is the DHCP server for the network.

When the Device acts as a DHCP server, the following items need to be

set:

IP Pool

Starting

Address

This field specifies the first of the contiguous addresses in the IP

address pool.

Pool Size

This field specifies the size, or count of the IP address pool.

DHCP Relay

Select this option to have the Device forward DHCP request to the

DHCP server.

Relay Server

If you select

DHCP Relay

, enter the IP address of the DHCP server.

DNS Servers Assigned by DHCP Server

If you do not configure DNS servers, the Device uses its LAN IP address and tells the

DHCP clients on the LAN that itself is the DNS server. When a LAN client sends a DNS

query to the Device, the Device forwards the query to its system DNS server you

configured in the WAN screen.

Obtain DNS

info from a

WAN

interface:

Select this to have the Device get the DNS server addresses from one

of the Device’s WAN interfaces.

WAN

Interface

Select a WAN interface through which to get DNS server addresses.

Use the

following

Static DNS IP

address

Select this to have the Device use the DNS server addresses you

configure manually.

First DNS

Server

Enter the first DNS (Domain Name System) server IP address the

Device passes to the DHCP clients.

Second DNS

Server

Enter the second DNS (Domain Name System) server IP address the

Device passes to the DHCP clients.

IGMP Snooping

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6.4

The Client List Screen

Click

Network > LAN > Client List

to open the

Client List

screen. Use this

screen to look at the IP addresses currently assigned to DHCP clients and the IP

addresses reserved for specific MAC addresses.

Figure 48

Network > LAN > Client List

The following table describes the fields in this screen.

Active IGMP

Snooping

Select this option to enable IGMP snooping. This allows the Device to

passively learn multicast group.

Standard

Mode

Select this to have the Device forward multicast packets to a port that

joins the multicast group and broadcast unknown multicast packets

from the WAN to all LAN ports.

Blocking Mode

Select this to have the Device block all unknown multicast packets

from the WAN.

Active IP Alias

Select the check box to configure another LAN network for the Device.

IP Address

Enter the IP address of your Device in dotted decimal notation.

IP Subnet

Mask

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

example 255.255.255.0 (factory default).

Apply

Click

Apply

to save your changes back to the Device.

Table 23

Network > LAN > IP (continued)

LABEL

DESCRIPTION

Table 24

Network > LAN > Client List

LABEL

DESCRIPTION

IP Address

Enter an IP address that you want to reserve for a specific device.

MAC Address

Enter an MAC address of a device on your LAN to which you want to

assign the specified IP address.

Add Entries

Click this to add a entry that reserves the specified IP address for the

device with the specified MAC address.

#

This field is a sequential value, and it is not associated with a specific

entry.

IP Address

This field displays the IP address currently assigned to a DHCP client or

reserved for a specific MAC address.

MAC Address

This field displays the MAC address to which the IP address is currently

assigned or for which the IP address is reserved.

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