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

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Chapter 5 WAN Setup

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Note: If you configure only one IPoA or IPoE connection using the ATM interface on

the Device, you must enter the static DNS server address.

Figure 42

WAN Configuration: DNS Server: PPPoE, PPPoA, IPoE or IPoA

The following table describes the labels in this screen.

Table 21

WAN Configuration: DNS Server: PPPoE or IPoE

LABEL

DESCRIPTION

Select DNS

Server Interface

from available

WAN interfaces

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

of the Device’s WAN interfaces.

Selected DNS

Server Interfaces

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

You can select multiple WAN interfaces for the device to try. The

Device tries the WAN interfaces in the order listed and uses only the

DNS server information of the first WAN interface that connects; there

is no backup WAN function. To change the priority order remove them

all and add them back in again.

Available WAN

Interfaces

These are the WAN interfaces you can select from.

Use the following

Static DNS IP

address

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

configure manually.

Primary DNS

server

Enter the first DNS server address assigned by the ISP.

Secondary

DNS server

Enter the second DNS server address assigned by the ISP.

Back

Click this button

to return to the previous screen.

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5.6.1.7

Configuration Summary

This read-only screen shows the current WAN connection settings.

Figure 43

WAN Configuration: Configuration Summary

The following table describes the labels in this screen.

Table 22

WAN Configuration: Configuration Summary

LABEL

DESCRIPTION

Connection Type

This is the encapsulation method used by this connection.

Service Name

This is the name of the service.

Service Category

This is the ATM traffic class.

This field is blank for a PTM or Ethernet WAN connection.

IP Address

This shows whether the WAN IP address is assigned by the ISP,

manually configured or not configurable.

Service State

This shows whether this service is active or not.

NAT

This shows whether NAT is active or not for this connection.

Full Cone NAT

This shows whether full cone NAT is active or not for this connection.

Firewall

This shows whether Firewall is active or not for this connection.

IGMP Multicast

This shows whether IGMP multicasting is active or not for this

connection.

Back

Click this button

to return to the previous screen.

Apply/Save

Click this button to save your changes.

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5.7

Technical Reference

The following section contains additional technical information about the Device

features described in this chapter.

Encapsulation

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

work in bridge mode or routing mode. When the Device is in routing mode, it

supports the following methods.

IP over Ethernet

IP over Ethernet (IPoE) is an alternative to PPPoE. IP packets are being delivered

across an Ethernet network, without using PPP encapsulation. They 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 Ethernet cells.

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.

PPP over Ethernet

Point-to-Point Protocol over Ethernet (PPPoE) provides access control and billing

functionality in a manner similar to dial-up services using PPP. PPPoE is an IETF

standard (RFC 2516) specifying how a personal computer (PC) interacts with a

broadband modem (DSL, cable, wireless, etc.) connection.

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 Device (rather than individual computers),

the computers on the LAN do not need PPPoE software installed, since the Device

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does that part of the task. Furthermore, with NAT, all of the LANs’ computers will

have access.

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 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

access multiplexer). Please refer to RFC 2364 for more information on PPPoA.

Refer to RFC 1661 for more information on PPP.

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

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.

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.

Traffic Shaping

Traffic Shaping is an agreement between the carrier and the subscriber to regulate

the average rate and fluctuations of data transmission over an ATM network. This

agreement helps eliminate congestion, which is important for transmission of real

time data such as audio and video connections.

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Peak Cell Rate (PCR) is the maximum rate at which the sender can send cells. This

parameter may be lower (but not higher) than the maximum line speed. 1 ATM

cell is 53 bytes (424 bits), so a maximum speed of 832Kbps gives a maximum

PCR of 1962 cells/sec. This rate is not guaranteed because it is dependent on the

line speed.

Sustained Cell Rate (SCR) is the mean cell rate of each bursty traffic source. It

specifies the maximum average rate at which cells can be sent over the virtual

connection. SCR may not be greater than the PCR.

Maximum Burst Size (MBS) is the maximum number of cells that can be sent at

the PCR. After MBS is reached, cell rates fall below SCR until cell rate averages to

the SCR again. At this time, more cells (up to the MBS) can be sent at the PCR

again.

If the PCR, SCR or MBS is set to the default of "0", the system will assign a

maximum value that correlates to your upstream line rate.

The following figure illustrates the relationship between PCR, SCR and MBS.

Figure 44

Example of Traffic Shaping

ATM Traffic Classes

These are the basic ATM traffic classes defined by the ATM Forum Traffic

Management 4.0 Specification.

Constant Bit Rate (CBR)

Constant Bit Rate (CBR) provides fixed bandwidth that is always available even if

no data is being sent. CBR traffic is generally time-sensitive (doesn't tolerate

delay). CBR is used for connections that continuously require a specific amount of

bandwidth. A PCR is specified and if traffic exceeds this rate, cells may be

dropped. Examples of connections that need CBR would be high-resolution video

and voice.

Rate

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