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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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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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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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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).

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