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Note: Regardless of your particular situation, do not create an arbitrary IP address;

always follow the guidelines above. For more information on address assignment,

please refer to RFC 1597,

Address Allocation for Private Internets

and RFC 1466,

Guidelines for Management of IP Address Space.

5.2.2

RIP Setup

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

routers.

The

RIP Direction

field controls the sending and receiving of RIP packets.

When set to:

•

Both

-

the ZyXEL Device will broadcast its routing table periodically and incorporate the RIP

information that it receives.

•

In Only

-

the ZyXEL Device will not send any RIP packets but will accept all RIP packets received.

•

Out Only

-

the ZyXEL Device will send out RIP packets but will not accept any RIP packets

received.

•

None

-

the ZyXEL Device will not send any RIP packets and will ignore any RIP packets received.

The

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.

5.2.3

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 Multicast 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 ZyXEL Device supports both IGMP version 1 (

IGMP-v1

) and IGMP version 2 (

IGMP-v2

). At

start up, the ZyXEL Device queries all directly connected networks to gather group membership.

After that, the ZyXEL Device periodically updates this information. IP multicasting can be enabled/

disabled on the ZyXEL Device LAN and/or WAN interfaces in the web configurator (

LAN

;

WAN

).

Select

None

to disable IP multicasting on these interfaces.

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5.2.4

Any IP

Traditionally, you must set the IP addresses and the subnet masks of a computer and the ZyXEL

Device to be in the same subnet to allow the computer to access the Internet (through the ZyXEL

Device). 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 ZyXEL Device.

With the Any IP feature and NAT enabled, the ZyXEL Device 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 ZyXEL Device 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 ZyXEL Device 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 ZyXEL Device 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 ZyXEL Device are not in the same subnet.

Figure 33

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 ZyXEL Device’s IP address.

Note: You

must

enable NAT/SUA to use the Any IP feature on the ZyXEL Device.

5.2.4.1

How Any IP Works

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 ZyXEL Device) 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 ZyXEL Device.

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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 ZyXEL Device) 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 ZyXEL Device 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 ZyXEL Device.

5

When the ZyXEL Device 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 ZyXEL Device and the

Internet as if it is in the same subnet as the ZyXEL Device.

5.3

Configuring LAN IP

Click

LAN

to open the

IP

screen. See

Section 5.1 on page 63

for background information.

Figure 34

LAN IP

The following table describes the fields in this screen.

Table 18

LAN IP

LABEL

DESCRIPTION

TCP/IP

IP Address

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

example, 192.168.1.1 (factory default).

IP Subnet Mask

Type the subnet mask assigned to you by your ISP (if given).

Apply

Click

Apply

to save your changes back to the ZyXEL Device.

Cancel

Click

Cancel

to begin configuring this screen afresh.

Advanced Setup

Click this button to display the

Advanced LAN Setup

screen and edit more

details of your LAN setup.

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5.3.1

Configuring Advanced LAN Setup

To edit your ZyXEL Device's advanced LAN settings, click the

Advanced Setup

button in the

LAN

IP

screen. The screen appears as shown.

Figure 35

Advanced LAN Setup

The following table describes the labels in this screen.

Table 19

Advanced LAN Setup

LABEL

DESCRIPTION

RIP & Multicast

Setup

RIP Direction

Select the RIP direction from

None

,

Both

,

In Only

and

Out Only

.

RIP Version

Select the RIP version from

RIP-1

,

RIP-2B

and

RIP-2M

.

Multicast

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

establish membership in a multicast group. The ZyXEL Device supports both IGMP

version 1 (

IGMP-v1

) and

IGMP-v2

. Select

None

to disable it.

Any IP Setup

Select the

Active

check box to enable the Any IP feature. This allows a computer

to access the Internet without changing the network settings (such as IP address

and subnet mask) of the computer, even when the IP addresses of the computer

and the ZyXEL Device are not in the same subnet.

When you disable the Any IP feature, only computers with dynamic IP addresses

or static IP addresses in the same subnet as the ZyXEL Device’s LAN IP address

can connect to the ZyXEL Device or access the Internet through the ZyXEL Device.

Windows

Networking

(NetBIOS over

TCP/IP)

NetBIOS (Network Basic Input/Output System) are TCP or UDP packets that

enable a computer to connect to and communicate with a LAN. For some dial-up

services such as PPPoE or PPTP, NetBIOS packets cause unwanted calls. However

it may sometimes be necessary to allow NetBIOS packets to pass through to the

WAN in order to find a computer on the WAN.

Allow between

LAN and WAN

Select this check box to forward NetBIOS packets from the LAN to the WAN and

from the WAN to the LAN. If your firewall is enabled with the default policy set to

block WAN to LAN traffic, you also need to enable the default WAN to LAN firewall

rule that forwards NetBIOS traffic.

Clear this check box to block all NetBIOS packets going from the LAN to the WAN

and from the WAN to the LAN.

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5.4

DHCP Setup

Use this screen to configure the DNS server information that the ZyXEL Device sends to the DHCP

client devices on the LAN.

Figure 36

DHCP Setup

The following table describes the labels in this screen.

Back

Click

Back

to return to the previous screen.

Apply

Click

Apply

to save the changes.

Cancel

Click

Cancel

to begin configuring this screen afresh.

Table 19

Advanced LAN Setup (continued)

LABEL

DESCRIPTION

Table 20

DHCP Setup

LABEL

DESCRIPTION

DHCP Setup

DHCP

If set to

Server

, your ZyXEL Device can assign IP addresses, an IP default

gateway and DNS servers to Windows 95, Windows NT and other systems that

support the DHCP client.

If set to

None

, the DHCP server will be disabled.

If set to

Relay

, the ZyXEL Device acts as a surrogate DHCP server and relays

DHCP requests and responses between the remote server and the clients.

Enter the IP address of the actual, remote DHCP server in the

Remote DHCP

Server

field in this case.

When DHCP is used, 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.