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5.5

LAN Client List

This table allows you to assign IP addresses on the LAN to specific individual computers based on

their 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.

To change your ZyXEL Device’s static DHCP settings, click

Network > LAN

> Client List

. The

screen appears as shown.

Figure 37

LAN Client List

Remote DHCP Server

If

Relay

is selected in the

DHCP

field above then enter the IP address of the

actual remote DHCP server here.

DNS Server

DNS Servers

Assigned by DHCP

Server

The ZyXEL Device passes a DNS (Domain Name System) server IP address to

the DHCP clients.

Primary DNS Server

Secondary DNS

Server

This field is not available when you set

DHCP

to

Relay

.

Enter the IP addresses of the DNS servers. The DNS servers are passed to the

DHCP clients along with the IP address and the subnet mask.

If the fields are left as

0.0.0.0

, the ZyXEL Device acts as a DNS proxy and

forwards the DHCP client’s DNS query to the real DNS server learned through

IPCP and relays the response back to the computer.

Apply

Click

Apply

to save your changes back to the ZyXEL Device.

Reset

Click

Reset

to begin configuring this screen afresh.

Table 20

DHCP Setup

LABEL

DESCRIPTION

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The following table describes the labels in this screen.

5.6

LAN IP Alias

IP alias allows you to partition a physical network into different logical networks over the same

Ethernet interface. The ZyXEL Device supports three logical LAN interfaces via its single physical

Ethernet interface with the ZyXEL Device itself as the gateway for each LAN network.

Note: Make sure that the subnets of the logical networks do not overlap.

Table 21

LAN Client List

LABEL

DESCRIPTION

IP Address

Enter the IP address that you want to assign to the computer on your LAN with

the MAC address specified below.

The IP address should be within the range of IP addresses you specified in the

DHCP Setup

for the DHCP client.

MAC Address

Enter the MAC address of a computer on your LAN.

Add

Click

Add

to add a static DHCP entry.

#

This is the index number of the static IP table entry (row).

Status

This field displays whether the client is connected to the ZyXEL Device.

Host Name

This field displays the computer host name.

IP Address

This field displays the IP address relative to the # field listed above.

MAC Address

The MAC (Media Access Control) or Ethernet address on a LAN (Local Area

Network) is unique to your computer (six pairs of hexadecimal notation).

A network interface card such as an Ethernet adapter has a hardwired address

that is assigned at the factory. This address follows an industry standard that

ensures no other adapter has a similar address.

Reserve

Select the check box(es) in each entry to have the ZyXEL Device always assign

the selected entry(ies)’s IP address(es) to the corresponding MAC address(es)

(and host name(s)). You can select up to 32 entries in this table.

Modify

Click the modify icon to have the

IP address

field editable and change it.

Apply

Click

Apply

to save your changes back to the ZyXEL Device.

Cancel

Click

Cancel

to begin configuring this screen afresh.

Refresh

Click

Refresh

to reload the DHCP table.

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The following figure shows a LAN divided into subnets A, B, and C.

Figure 38

Physical Network & Partitioned Logical Networks

To change your ZyXEL Device’s IP alias settings, click

Network

>

LAN

>

IP Alias

. The screen

appears as shown.

Figure 39

LAN IP Alias

The following table describes the labels in this screen.

Table 22

LAN IP Alias

LABEL

DESCRIPTION

IP Alias 1, 2

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

IP Address

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

Alternatively, click the right mouse button to copy and/or paste the IP address.

IP Subnet Mask

Your ZyXEL Device 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 ZyXEL Device.

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RIP Direction

RIP (Routing Information Protocol, RFC 1058 and RFC 1389) allows a router to

exchange routing information with other routers. The

RIP Direction

field

controls the sending and receiving of RIP packets. Select the RIP direction from

Both

/

In Only

/

Out Only

/

None

. When set to

Both

or

Out Only

, the ZyXEL

Device will broadcast its routing table periodically. When set to

Both

or

In Only

,

it will incorporate the RIP information that it receives; when set to

None

, it will

not send any RIP packets and will ignore any RIP packets received.

RIP Version

The

RIP Version

field controls the format and the broadcasting method of the

RIP packets that the ZyXEL Device sends (it recognizes both formats when

receiving).

RIP-1

is universally supported but RIP-2 carries more information.

RIP-1 is probably adequate for most networks, unless you have an unusual

network topology. Both

RIP-2B

and

RIP-2M

sends the routing data in RIP-2

format; the difference being that

RIP-2B

uses subnet broadcasting while

RIP-

2M

uses multicasting. Multicasting can reduce the load on non-router machines

since they generally do not listen to the RIP multicast address and so will not

receive the RIP packets. However, if one router uses multicasting, then all

routers on your network must use multicasting, also. By default, RIP direction is

set to

Both

and the Version set to

RIP-1

.

Apply

Click

Apply

to save your changes back to the ZyXEL Device.

Cancel

Click

Cancel

to begin configuring this screen afresh.

Table 22

LAN IP Alias

LABEL

DESCRIPTION

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75

C

HAPTER

6

Network Address Translation (NAT) Screens

This chapter discusses how to configure NAT on the ZyXEL Device.

6.1

NAT Overview

NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a host in

a packet, for example, the source address of an outgoing packet, used within one network to a

different IP address known within another network.

6.1.1

NAT Definitions

Inside/outside denotes where a host is located relative to the ZyXEL Device, for example, the

computers of your subscribers are the inside hosts, while the web servers on the Internet are the

outside hosts.

Global/local denotes the IP address of a host in a packet as the packet traverses a router, for

example, the local address refers to the IP address of a host when the packet is in the local

network, while the global address refers to the IP address of the host when the same packet is

traveling in the WAN side.

Note that inside/outside refers to the location of a host, while global/local refers to the IP address

of a host used in a packet.

Thus, an inside local address (ILA) is the IP address of an inside host in

a packet when the packet is still in the local network, while an inside global address (IGA) is the IP

address of the same inside host when the packet is on the WAN side. The following table

summarizes this information.

NAT never changes the IP address (either local or global) of an outside host.

Table 23

NAT Definitions

ITEM

DESCRIPTION

Inside

This refers to the host on the LAN.

Outside

This refers to the host on the WAN.

Local

This refers to the packet address (source or destination) as the packet travels on the

LAN.

Global

This refers to the packet address (source or destination) as the packet travels on the

WAN.