User guide

PPPoE PPPoE Overview
iMG/RG Software Reference Manual (ADSL Port)
8-62
8.6.1.1.7 ETHERNET SHOW TRANSPORT
Syntax ETHERNET SHOW TRANSPORT {<name>|<number>}
Description This command displays the name and port used by an existing Ethernet transport.
Options The following table gives the range of values for each option that can be specified with
this command and a default value (if applicable).
Example --> ethernet show transport eth1
Ethernet transport: vlan_2
Description: vlan_2
Port: ethernet1
See also ETHERNET LIST TRANSPORTS
8.7 PPPoE
8.7.1 PPPoE Overview
The PPPoE (Point to Point Protocol over Ethernet) protocol provides user and network management, and
accounting benefits to ISPs and network administrators as ISPs can easily control client connections for xDSL
and cable modems as well as plain Ethernet networks. PPPoE is an extension of the standard Point to Point Pro-
tocol (PPP). The difference between them is expressed in transport method: PPPoE employs Ethernet instead
of serial line connection.
Generally speaking, PPPoE is used to assign IP addresses to clients based on the user authentication as opposed
to open connections where static IP addresses or DHCP are used.
PPPoE has two distinct stages. There is a Discovery stage and a PPP Session stage. When a Host wishes to ini-
tiate a PPPoE session, it must first perform Discovery to identify the Ethernet MAC address of the peer and
establish a PPPoE SESSION_ID.
The PPPoE Discovery Stage is made up of four steps: initiation, offer, request, and session confirmation:
The PPPoE Active Discovery Initiation (PADI) packet:
Option Description Default Value
name An existing Ethernet transport. To display transport names,
use the
ETHERNET LIST TRANSPORTS command.
N/A
number An existing Ethernet transport. To display transport num-
bers, use the
ETHERNET LIST TRANSPORTS com-
mand.
N/A