DHCP, DNS and Time
Dlink DRO-220i User Guide
23
2.5.3 PPPoE Mode
In this mode, ISP provides the Global IP address automatically using PPPoE Protocol.
PPPoE protocol is a method of transmitting PPP packets over Ethernet network. Hence
PPPoE is an acronym for PPP over Ethernet. It provides the ability to connect multiple
hosts at a remote site through the same customer premise access device. In addition, it
provides access control, billing and type of service on a per-user, rather than a per-site,
basis.
PPP has three main components:
•
A method for encapsulating datagram over serial links.
•
A Link Control Protocol (LCP) for establishing, configuring, and testing the data-
link connection.
•
A family of Network Control Protocols (NCP) for establishing and configuring
different network-layer protocols. PPP is designed to allow the simultaneous use
of multiple network layer protocols.
PPPoE has two distinct stages. There is a Discovery stage and a PPP Session stage.
When a Host wishes to initiate a PPPoE session, it must first perform Discovery to
identify the Ethernet MAC address of the peer and establish a PPPoE SESSION_ID.
While PPP defines a peer-to-peer relationship, Discovery is inherently a client-server
relationship. In the Discovery process, a Host (the client) discovers an Access
Concentrator (the server). Based on the network topology, there may be more than one
Access Concentrator that the Host can communicate with. The Discovery stage allows
the Host to discover all Access Concentrators and then select one. When Discovery
completes successfully, both the Host and the selected Access Concentrator have the
information they will use to build their point-to-point connection over Ethernet.
Unnumbered Interfaces:
Point-to-point links are like pipes – any traffic sent through one end will be received at
the other end. So the IP Addresses of interfaces at either end of the point-to-point link can
be of local significance. The PPPoE interface at the router can be configured as an
unnumbered interface. In this case, the unnumbered interface can borrow the LAN IP
Address, and does not require a Global IP Addresses to be assigned by the ISP.
Select
Interface
→
WAN3
and choose
IP Setting Mode
as
PPPoE
.
Configure
PPPoE
Settings for WAN3 Interface
as explained below.
PPPoE Settings for WAN3 Interface
Unnumber Interface
Select the option to enable unnumbered mode. When this option is not
selected the router obtains an IP address from the ISP for the PPPoE
connection. Ensure that both ends of the PPPoE link are configured as
unnumbered.
Web UI
