6381-A4 Router Users Guide

36

Debug

Enables PPPoE connection debugging facilities. The

Debug

option is used by ISP

technical support and ODM/OEM testers to simulate packets going through the

network from the WAN side.

PPP

Unnumbered

Specifies that the calling and answering routers will not request IP addresses.

PPP Unnumbered is a special feature. It enables the ISP to designate a block of

public IP addresses to the customer where it is statically assigned on the LAN

side. PPP Unnumbered is, in essence, like a bridged connection.

LAN

The LAN field is associated with the PPP Unnumbered field and is enabled when

the PPP Unnumbered field is checked. You can specify the LAN group the packets

need to go to when the PPP Unnumbered feature is activated.

Valid Rx

This field is used in conjunction with the On-Demand feature and is enabled only

when the On Demand field is checked.

When the On-Demand feature is enabled and Valid Rx is unchecked, only packets

going from the LAN side to the WAN side keep the link active. After the RG times

out, no packets can be received from the WAN side to the LAN side.

When Valid Rx is checked, the incoming packets can keep the PPPoE WAN

connection active. There is one condition; this incoming packet should belong to a

connection initiated from a LAN-side device.

Host Trigger

This field is used in conjunction with the On-Demand feature and is enabled only

when the On Demand field is checked.

There are three types of packets:

•

LAN packets (type 1): packets routed through the RG from LAN to WAN.

•

Proxied packets (type 2): packets generated by the RG after receiving

packets from the LAN side, such as DNS proxy.

•

Locally generated packets (type 3): Packets generated by the RG, such as

Voice, SNMP, etc.

When the On-Demand feature is enabled and Host Trigger is unchecked,

only

flow of type 1 packets keeps the link active, i.e., if the RG has not received type 1

packets for x mount of time (as specified in the Time Out field), the connection

times out.

If Host Trigger is checked, type 2 and type 3 packets can keep the link active as

well. You can configure the packets using the Trigger Traffic page, which is

accessed by clicking the Configure button next to Host Trigger. The following fields

can be used to identify the traffic of type 2 and/or type 3 that will keep the link

alive:

•

Source Port (the character * is used to denote any port)

•

Destination Port (the character * is used to denote any port)

•

Protocol (TCP, UDP, ICMP, or Specify the protocol number)

7.

In the

PVC Settings

section, enter values as supplied by your ISP

I

.

PVC Settings:

PVC

Permanent virtual circuit. This is a fixed virtual circuit between two users. It is the

public data network equivalent of a leased line. No call setup or clearing

procedures are needed.

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37

VPI

Virtual path identifier, equivalent to the virtual path connection (VPC).

VCI

Virtual channel identifier. A 16-bit field in the header of an ATM cell. The VCI,

together with the VPI, is used to identify the next destination of a cell as it passes

through to the ATM switch.

QoS

Quality of service, a characteristic of data transmission that measures how

accurately and how quickly a message or data is transferred from a source host to

a destination host over a network. The three QoS options are:

•

Undefined Bit Rate (

UBR

): When UBR is selected, the PCR, SCR, and

MBS fields are disabled.

•

Constant Bit Rate (

CBR

): When CBR is selected, the PCR field is

enabled.

•

Variable Bit Rate (

VBR

): When VBR is selected, the PCR, SCR, and MBS

fields are enabled.

More on QoS is covered in Quality of Service (QoS) on page 92.

PCR

Peak cell rate, measured in cells/sec, is the cell rate which the source may never

exceed.

SCR

Sustained cell rate, measured in cells/sec, is the average cell rate over the

duration of the connection.

MBS

Maximum burst size, a traffic parameter that specifies the maximum number of

cells that can be transmitted at the Peak Cell Rate.

Auto PVC

Auto-Sensing permanent virtual circuit. The overall operation of the auto-sensing

PVC feature relies on end-to-end OAM pings to defined PVCs. There are two

groups of PVCs: customer default PVCs which are defined by the OEM/ISP and

the backup PVCs. The customer default must have 0/35 as the first default PVC.

The backup list of PVCs must be of the following VPI/VCI: 0/35, 8/35, 0/43, 0/51,

0/59, 8/43, 8/51, and 8/59. The lists of PVCs are defined in XML and are

configurable. The Auto-Sensing PVC feature itself is also configurable in that the

auto-search mechanism can be disabled.

Upon DSL synchronization, end-to-end OAM pings will be conducted for each

defined PVC. The result of the pings will be recorded in an array for later use to

determine the usability of the particular PVC for connectivity. This list helps the

PVC manage the available PVC for use, and needs to be synchronized with

connections made without Auto-Sensing PVC. Update to this list is performed for

any change in DSL synchronization.

During connection establishment, the PVC module will first search through the list

of defined default PVCs. If a PVC is found from the default list that is ping-able

and not in use, the PVC module will update for that particular PVC as in-use from

the list and continues processing. If a PVC is not found in the default, the backup

PVC list is used. If no PVC is found again, the module will let the end-user know

that no available VCC was found.

With the connection established, the PVC is stored in flash as the connection

default PVC. Therefore upon reboot, this PVC is automatically chosen as the PVC

for that connection. This saved PVC in environment space of flash overrides the

PVC connection saved in XML configuration space of flash for that connection.

During the connection establishment processing, the saved PVC will be checked

to see whether a connection can be made with the PVC. If the PVC is OAM ping-

able, the connection process continues. If the PVC is not OAM ping-able, the

search for available PVC starts. The process of PVC selection is the same as

described above.

The list of default PVCs and backup PVCs need to be global for the management

of all connections, non Auto-Sensing PVC connection, as well as, Auto-Sensing

PVC connections. These lists allow the end-users to establish connectivity without

keeping track of the PVC used.

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38

8.

Select the

Quality of Service (

QOS

).

Leave the default value if your ISP did not provide this information. Depending on the QoS

you select, you may also enter:

•

PCR (Peak Cell Rate)

•

SCR (Sustainable Cell Rate)

•

MBS (Maximum Burst Size)

•

CDVT (Cell Delay Variation Tolerance)

9.

To complete the connection you must now click the

Apply

button.

The

Apply

button will temporarily save this connection. To make the change permanent,

click

Tools

(at the top of the page) and select

System Commands

. On the

System

Commands

page, click

Save All

.

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39

PPPoA Connection Setup

PPPoA is defined in the Internet standard RFC 2364. It is a method of encapsulating PPP

packets over ATM cells which are carried over the DSL line.

PPP (Point-to-Point Protocol) is a method of establishing a network session between network

hosts. It usually provides a mechanism of authenticating users. LLC and VC are two different

methods of encapsulating the PPP packet. Contact your ISP to make sure which encapsulation is

being supported.

By selecting PPPoA, you force your router to act as the termination point for the PPPoA

connection. This frees up your PC resources and allows multiple users to utilize the PPPoA

connection.

To configure the router for PPPoA:

1.

From the

Home

page, click

Setup

and then click

New Connection

.

The default PPPoA connection setup is displayed as the default setup.

2.

In the

Type

dropdown select

PPPoA

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40

The PPPoA connection setup page is displayed.

3.

In the

Name

text box enter a unique name for the connection

The name must not have spaces and cannot begin with numbers.

4.

The

NAT

(Network Address Translation) and

Firewall

check boxes should be checked by

default.

NAT enables the IP address on the LAN side to be translated to IP address on the WAN

side. If NAT is disabled, you cannot access the Internet.

The firewall is designed to provide protection from unauthorized Internet users accessing

your network.

5.

To configure the connection sharing type, select

Disable

,

Enable

or

VLAN

from the

Sharing

drop down.

Configure connection sharing as directed by your ISP.

DSL creates a permanent virtual connection (PVC) between network endpoints. This

connection may be shared where each device may have access to the packets, or the

connection may be segregated. In other words multiple connections over the same PVC are

supported. VLAN support requires that the ISP have VLANs supported and identified

Disable

Disables connection sharing

Enable

Enables connection sharing

VLAN

Sets up a virtual LAN. To configure the VLAN you will need to provide a VLAN ID

and Priority Bits. Priority is given to a VLAN connection from 0-7. All packets sent

over the VLAN connection have the Priority bits set to the configured value.

6.

In the

PPP Settings

section, enter values as supplied by your ISP.

PPP Settings:

Encapsulation

The technique used by layered protocols in which a layer adds header information

to the protocol data unit (PDU) from the layer above. As an example, in Internet

terminology, a packet would contain a header from the data link layer, followed by

a header from the network layer (IP), followed by a header from the transport layer

(TCP), followed by the application protocol data. Two options are provided: Logical

Link Control (

LLC

) and Virtual Channel (

VC

).

Username

The username for the PPPoA access. This is provided by your DSL service

provider or your ISP.

Password

The password for the PPPoA access. This is provided by your DSL service

provider or your ISP.

Idle Timeout

Specifies that PPPoA connection should disconnect if the link has no activity

detected for the specified number of seconds. This field is used in conjunction with

the

On Demand

feature and is enabled only when the

On Demand

field is

checked. To disable the timeout feature, enter a zero in this field.

Keep Alive

When the

On Demand

option is not enabled, this value specifies the length of time

to wait without being connected to your provider before terminating the connection.

To ensure that the link is always active, enter a 0 in this field. You can also enter

any positive integer value in this field.

Authentication

Specifies the authentication protocol:

•

Auto (the protocol is selected by the Central Office modem)

•

PAP (Password Authentication Protocol)

•

CHAP (Challenge Handshake Authentication Protocol).