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Page 836 / 998 Scroll up to view Page 831 - 835
PPPoE
PPPoE Functional Overview
iMG/RG Software Reference Manual (ADSL Port)
8-66
8.7.2.4 Populating automatically routing table and DNS server table
During the PPP connection establishment, the Network Control Protocol IPCP is called to negotiate the IP
address of the local end of the link and to retrieve, eventually, a list of DNS server ip addresses.
The negotiated local IP address is used to assign the ip address value to the un-numbered IP interface attached
to the PPPoE transport. In this case when the PPP session is established, the un-numbered IP interface changes
from having a null IP address to the new negotiated IP address and every time the PPP session is closed, the IP
interface will revert back to having a null IP address.
Note:
Note that, even if the IP interface is attached to a PPP transport, the IP subnet mask is
assumed to be the class-based subnet mask of the IP address that has been allocated.
It’s possible force the PPPoE transport to assign always a 32bit subnet mask (all ones) to the IP interface via the
configuration command:
pppoe set transport <pppoe_name> subnetmask 255.255.255.255
In this way, independently of the IP address value assigned by the Remote Access Server, the IP interface will be
configured as a single host address.
Note:
Note that if more than one PPP connection is active at the same time on the CPE, adjacent IP
addresses can fall into the same subnet causing the IP addresses assignment to fail. In this
case, it’s strongly suggested to force each PPPoE transport to assign a 32bit subnet mask (all
ones) to the IP interface.
The PPPoE transport object is also able to set automatically the CPE default route to use the IP interface to
which the PPPoE object is attached. By default this functionality is turned ON and can be deactivated or re-acti-
vated via the command:
pppoe set transport <pppoe_name> createroute disabled|enabled
Note:
If more than one PPP connection is active at the same time on the CPE, all those, by default,
will try to configure the default route causing possible problems on the proper packets routing.
To avoid this, it’s strongly suggested to have only one PPP session that drives the default
route configuration.
Instead to create the default route when a PPP connection is established successfully, it’s possible inform the
PPPoE transport object to create a specific route based on the IP address of the Remote Access Server and a
subnet mask configured manually. In this case the default route cannot be created automatically because the
PPPoE transport object is able to create only one route (default or specific) at the same time. To inform the
PPPoE module to create a specific rule instead of the default route, the following commands are used:
pppoe set transport <pppoe_name> specifyroute enabled
pppoe set transport <pppoe_name> routemask <specific_route_mask>
The capability of the PPPoE transport object to configure automatically the properties of other modules is also
extended to the DNS Client and DNS Relay modules. It’s possible force, during IPCP phase, the PPP module to
Page 837 / 998
Functional Differences in Product Categories
PPPoE
8-67
iMG/RG Software Reference Manual (ADSL Port)
requests for DNS primary and secondary IP addresses and, if received, assigns them to the DNS Client and
DNS relay lists respectively. This feature can be enabled via the commands:
pppoe set transport <pppoe_name> givedns client enabled|disabled
pppoe set transport <pppoe_name> givedns relay enabled|disabled
pppoe set transport <pppoe_name> discoverdns enabled|disabled
8.7.2.5 Configuration Option to Clamp Maximum TCP MSS Value
When using the PPPoE client on the iMG, either the iMG or the PPPoE concentrator/RAS should be configured
to clamp the maximum TCP MSS value. For PPPoE the maximum mss is 1452.
On the iMG the command to perform this is
IP SET INTERFACE <ip interface> tcpmssclamp
enabled
(Refer to
4.1.8.2.49
.)
On a device such as one by Cisco, the command would be
ip tcp adjust -mss 1452
.
Note:
Without this clamp, connectivity issues could occur, and access to some websites could fail.
8.7.3
Functional Differences in Product Categories
8.7.4
PPPoE command reference
This section describes the commands available to enable, configure and manage the
PPPoE
module.
8.7.4.1 PPPoE CLI commands
The table below lists the
PPPoE
commands provided by the CLI:
TABLE 8-6
Functional Mapping for PPPoE
Commands
Fiber
A
Fiber
B
Fiber
C
Fiber
D
Fiber
E
Modular
ADSL
A
ADSL
B
ADSL
C
PPPOE CONNECTIONS
X
X
X
X
X
X
X
X
X
PPPOE CONNECTIONS OVER ATM -
VLAN UNAWARE
X
X
X
PPPOE CONNECTIONS - VLAN AWARE
X
X
X
X
X
X
X
X
X
POPULATING AUTOMATICALLY ROUT-
ING TABLE AND DNS SERVER TABLE
X
X
X
X
X
X
X
X
X
Page 838 / 998
PPPoE
PPPoE command reference
iMG/RG Software Reference Manual (ADSL Port)
8-68
TABLE 8-7
PPP
O
E
COMMANDS
PROVIDED
BY
THE
CLI
Functions
Fiber
A
Fiber
B
Fiber
C
Fiber
D
Fiber
E
Modular
ADSL
A
ADSL
B
ADSL
C
PPPOE ADD TRANSPORT DIALOUT ETH
X
X
X
X
X
X
X
X
X
PPPOE ADD TRANSPORT DIALOUT PVC
X
X
X
PPPOE CLEAR TRANSPORTS
X
X
X
X
X
X
X
X
X
PPPOE DELETE TRANSPORT
X
X
X
X
X
X
X
X
X
PPPOE LIST TRANSPORTS
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT ACCESSCONCENTRATOR
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT AUTOCONNECT
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT AUTOCONNECT FILTER
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT BT
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT CONNECTNOW
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT CREATEROUTE
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT DIALOUT
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT DISCOVERDNS PRIMARY
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT DISCOVERDNS SECONDARY
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT DISCOVERIPSUBNET
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT ENABLED|DISABLED
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT ETH
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT EVENTLEVEL
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT GIVEDNS CLIENT
ENABLED|DISABLED
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT GIVEDNS RELAY
ENABLED|DISABLED
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT HEADERS LLC
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT HEADERS LLC_ROUTED
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT HEADERS VCMUX_BRIDGED
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT HEADERS VCMUX_ROUTED
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT IDLETIME LANTRAFFICONLY
X
X
X
X
X
X
X
X
X
Page 839 / 998
PPPoE command reference
PPPoE
8-69
iMG/RG Software Reference Manual (ADSL Port)
PPPOE SET TRANSPORT IDLETIMEOUT
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT INTERFACE
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT LCPECHOEVERY
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT LCPMAXCONF
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT LCPMAXFAIL
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT LCPMAXTERM
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT LOCALIP
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT MANUALCONNECT
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT MAXREAUTHATTEMPTS
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT MBS
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT MCR
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT PASSWORD
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT PCR
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT PRILEVELS
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT PVC
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT QOSCLASS
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT
RANDOMIZECONNECTIONATTEMPTS
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT REAUTHTIMER TR68
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT REMOTEDNS
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT REMOTEIP
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT ROUTEMASK
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT SCR
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT SERVICENAME
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT SPECIFICROUTE
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT START/STOP TEST
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT SUBNETMASK
X
X
X
X
X
X
X
X
X
Functions
Fiber
A
Fiber
B
Fiber
C
Fiber
D
Fiber
E
Modular
ADSL
A
ADSL
B
ADSL
C
Page 840 / 998
PPPoE
PPPoE command reference
iMG/RG Software Reference Manual (ADSL Port)
8-70
8.7.4.1.1 PPPOE ADD TRANSPORT DIALOUT ETH
Syntax
PPPOE ADD TRANSPORT <name> DIALOUT ETH <interface>
<vlan_name> [ACCESSCONCENTRATOR <concentrator>] [SERVICENAME
<servicename>]
Description
This command creates a PPPoE transport that performs dialout over a VLAN. It allows
you to specify the following PVC information:
•
The VLAN name that will transport data
•
Access concentrator (optional)
•
Service name (optional)
Op
t
ionsThe following table gives the range of values for each option that can be speci-
fied with this command and a default value (if applicable).
PPPOE SET TRANSPORT THEYLOGIN
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT USERNAME
X
X
X
X
X
X
X
X
X
PPPOE SET TRANSPORT WELOGIN
X
X
X
X
X
X
X
X
X
PPPOE SHOW TRANSPORT
X
X
X
X
X
X
X
X
X
Option
Description
Default Value
Name
An arbitrary name that identifies the transport. It can be
made up of one or more letters or a combination of let-
ters and digits, but it cannot start with a digit.
N/A
Interface
The PPP interface to a channel that transports PPPoE data.
The interface value must be the ID value of the IP interface
that will be attached to the PPPoE transport. The IP ID
value is reported by the command
ip list interfaces
.
N/A
vlan_name
The vlan name that will be used to transport PPPoE
frames.
N/A
concentrator
A PPPoE tag that identifies a remote access concentrator
(or PPPoE server). PPPoE will only connect to the named
access concentrator. If no concentrator tag is set, PPPoE
connects to the first access concentrator that responds. It
is your ISP that determines the tag name/number.
N/A
Functions
Fiber
A
Fiber
B
Fiber
C
Fiber
D
Fiber
E
Modular
ADSL
A
ADSL
B
ADSL
C

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