Zyxel P-660HN-T1A Router Manual PDF (Setup & Configuration Guide)

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Chapter 6 WAN Setup

P-660HN-TxA User’s Guide

81

The following table describes the labels in this screen.

Table 19

Network > WAN > More Connections: Edit

LABEL

DESCRIPTION

General

Active

Select the check box to activate or clear the check box to

deactivate this connection.

Name

Enter a unique, descriptive name of up to 13 ASCII characters for

this connection.

Mode

Select

Routing

from the drop-down list box if your ISP allows

multiple computers to share an Internet account.

If you select

Bridge

, the ZyXEL Device will forward any packet

that it does not route to this remote node; otherwise, the packets

are discarded.

Encapsulation

Select the method of encapsulation used by your ISP from the

drop-down list box. Choices vary depending on the mode you

select in the

Mode

field.

If you select

Bridge

in the

Mode

field, select either

PPPoA

or

RFC 1483

.

If you select

Routing

in the

Mode

field, select

PPPoA

,

RFC

1483

,

ENET ENCAP

or

PPPoE

.

Multiplexing

Select the method of multiplexing used by your ISP from the

drop-down list. Choices are

VC

or

LLC

.

By prior agreement, a protocol is assigned a specific virtual

circuit, for example, VC1 will carry IP. If you select VC, specify

separate VPI and VCI numbers for each protocol.

For LLC-based multiplexing or PPP encapsulation, one VC carries

multiple protocols with protocol identifying information being

contained in each packet header. In this case, only one set of VPI

and VCI numbers need be specified for all protocols.

VPI

The valid range for the VPI is 0 to 255. Enter the VPI assigned to

you.

VCI

The valid range for the VCI is 32 to 65535 (0 to 31 is reserved for

local management of ATM traffic). Enter the VCI assigned to you.

IP Address

This option is available if you select

Routing

in the

Mode

field.

A static IP address is a fixed IP that your ISP gives you. A

dynamic IP address is not fixed; the ISP assigns you a different

one each time you connect to the Internet.

If you use the encapsulation type except

RFC 1483

, select

Obtain an IP Address Automatically

when you have a

dynamic IP address; otherwise select

Static IP Address

and

type your ISP assigned IP address in the

IP Address

field below.

If you use

RFC 1483

, enter the IP address given by your ISP in

the

IP Address

field.

Subnet Mask

This option is available if you select

ENET ENCAP

in the

Encapsulation

field.

Enter a subnet mask in dotted decimal notation.

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Chapter 6 WAN Setup

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82

6.3.2

Configuring More Connections Advanced Setup

Use this screen to edit your ZyXEL Device's advanced WAN settings. Click the

Advanced Setup

button in the

More Connections Edit

screen. The screen

appears as shown.

Figure 34

Network > WAN > More Connections: Edit: Advanced Setup

ENET ENCAP

Gateway

This option is available if you select

ENET ENCAP

in the

Encapsulation

field.

Specify a gateway IP address (supplied by your ISP).

Connection

Nailed-Up Connection

Select

Nailed-Up Connection

when you want your connection

up all the time. The ZyXEL Device will try to bring up the

connection automatically if it is disconnected.

Connect on Demand

Select

Connect on Demand

when you don't want the connection

up all the time and specify an idle time-out in the

Max Idle

Timeout

field.

Max Idle Timeout

Specify an idle time-out in the

Max Idle Timeout

field when you

select

Connect on Demand

. The default setting is 0, which

means the Internet session will not timeout.

NAT

SUA only

is available only when you select

Routing

in the

Mode

field.

Select

SUA Only

if you have one public IP address and want to

use NAT. Click

Edit Detail

to go to the

Port Forwarding

screen

to edit a server mapping set.

Otherwise, select

None

to disable NAT.

Back

Click this to return to the previous screen without saving.

Apply

Click this to save your changes.

Cancel

Click this to restore your previously saved settings.

Advanced Setup

Click this to display the

More Connections

Advanced Setup

screen and edit more details of your WAN setup.

Table 19

Network > WAN > More Connections: Edit (continued)

LABEL

DESCRIPTION

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Chapter 6 WAN Setup

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The following table describes the labels in this screen.

6.4

WAN Technical Reference

This section provides some technical background information about the topics

covered in this chapter.

6.4.1

Encapsulation

Be sure to use the encapsulation method required by your ISP. The ZyXEL Device

supports the following methods.

Table 20

Network > WAN > More Connections: Edit: Advanced Setup

LABEL

DESCRIPTION

ATM QoS

ATM QoS Type

Select

CBR

(Continuous Bit Rate) to specify fixed (always-on)

bandwidth for voice or data traffic. Select

UBR

(Unspecified Bit

Rate) for applications that are non-time sensitive, such as e-mail.

Select

nrtVBR

(Variable Bit Rate-non Real Time) or

rtVBR

(Variable Bit Rate-Real Time) for bursty traffic and bandwidth

sharing with other applications.

Peak Cell Rate

Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to

find the Peak Cell Rate (PCR). This is the maximum rate at which

the sender can send cells. Type the PCR here.

Sustain Cell Rate

The Sustain Cell Rate (SCR) sets the average cell rate (long-term)

that can be transmitted. Type the SCR, which must be less than

the PCR. Note that system default is 0 cells/sec.

Maximum Burst Size

Maximum Burst Size (MBS) refers to the maximum number of

cells that can be sent at the peak rate. Type the MBS, which is

less than 65535.

MTU

The Maximum Transmission Unit (MTU) defines the size of the

largest packet allowed on an interface or connection. Enter the

MTU in this field.

For ENET ENCAP, the MTU value is 1500.

For PPPoE, the MTU value is 1492.

For PPPoA and RFC, the MTU is 65535.

Back

Click this to return to the previous screen without saving.

Apply

Click this to save your changes.

Cancel

Click this to restore your previously saved settings.

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6.4.1.1

ENET ENCAP

The MAC Encapsulated Routing Link Protocol (ENET ENCAP) is only implemented

with the IP network protocol. IP packets are routed between the Ethernet interface

and the WAN interface and then formatted so that they can be understood in a

bridged environment. For instance, it encapsulates routed Ethernet frames into

bridged ATM cells. ENET ENCAP requires that you specify a gateway IP address in

the

Gateway IP Address

field in the wizard or WAN screen. You can get this

information from your ISP.

6.4.1.2

PPP over Ethernet

The ZyXEL Device supports PPPoE (Point-to-Point Protocol over Ethernet). PPPoE is

an IETF Draft standard (RFC 2516) specifying how a personal computer (PC)

interacts with a broadband modem (DSL, cable, wireless, etc.) connection. The

PPPoE option is for a dial-up connection using PPPoE.

For the service provider, PPPoE offers an access and authentication method that

works with existing access control systems (for example RADIUS).

One of the benefits of PPPoE is the ability to let you access one of multiple network

services, a function known as dynamic service selection. This enables the service

provider to easily create and offer new IP services for individuals.

Operationally, PPPoE saves significant effort for both you and the ISP or carrier, as

it requires no specific configuration of the broadband modem at the customer site.

By implementing PPPoE directly on the ZyXEL Device (rather than individual

computers), the computers on the LAN do not need PPPoE software installed,

since the ZyXEL Device does that part of the task. Furthermore, with NAT, all of

the LANs’ computers will have access.

6.4.1.3

PPPoA

PPPoA stands for Point to Point Protocol over ATM Adaptation Layer 5 (AAL5). A

PPPoA connection functions like a dial-up Internet connection. The ZyXEL Device

encapsulates the PPP session based on RFC1483 and sends it through an ATM PVC

(Permanent Virtual Circuit) to the Internet Service Provider’s (ISP) DSLAM (Digital

Subscriber Line (DSL) Access Multiplexer). Please refer to RFC 2364 for more

information on PPPoA. Refer to RFC 1661 for more information on PPP.

6.4.1.4

RFC 1483

RFC 1483 describes two methods for Multiprotocol Encapsulation over ATM

Adaptation Layer 5 (AAL5). The first method allows multiplexing of multiple

protocols over a single ATM virtual circuit (LLC-based multiplexing) and the second

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method assumes that each protocol is carried over a separate ATM virtual circuit

(VC-based multiplexing). Please refer to RFC 1483 for more detailed information.

6.4.2

Multiplexing

There are two conventions to identify what protocols the virtual circuit (VC) is

carrying. Be sure to use the multiplexing method required by your ISP.

VC-based Multiplexing

In this case, by prior mutual agreement, each protocol is assigned to a specific

virtual circuit; for example, VC1 carries IP, etc. VC-based multiplexing may be

dominant in environments where dynamic creation of large numbers of ATM VCs is

fast and economical.

LLC-based Multiplexing

In this case one VC carries multiple protocols with protocol identifying information

being contained in each packet header. Despite the extra bandwidth and

processing overhead, this method may be advantageous if it is not practical to

have a separate VC for each carried protocol, for example, if charging heavily

depends on the number of simultaneous VCs.

6.4.3

VPI and VCI

Be sure to use the correct Virtual Path Identifier (VPI) and Virtual Channel

Identifier (VCI) numbers assigned to you. The valid range for the VPI is 0 to 255

and for the VCI is 32 to 65535 (0 to 31 is reserved for local management of ATM

traffic). Please see the appendix for more information.

6.4.4

IP Address Assignment

A static IP is a fixed IP that your ISP gives you. A dynamic IP is not fixed; the ISP

assigns you a different one each time. The Single User Account feature can be

enabled or disabled if you have either a dynamic or static IP. However the

encapsulation method assigned influences your choices for IP address and ENET

ENCAP gateway.

IP Assignment with PPPoA or PPPoE Encapsulation

If you have a dynamic IP, then the

IP Address

and

Gateway IP Address

fields

are not applicable (N/A). If you have a static IP, then you only need to fill in the

IP

Address

field and not the

Gateway IP Address

field.

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