Planning for DSL Support Over a PPPoE Tunnel
Some DSL providers require you to set up PPPoE tunneling for
your site in order to run PPP over the providers' DSL lines and high-speed
digital networks. For an overview of PPPoE, see Support for DSL Users Through PPPoE.
A PPPoE tunnel involves three participants: a consumer, a telephone
company, and an ISP. You either configure PPPoE for consumers, such
as PPPoE clients at your company or consumers in their homes, or you
configure PPPoE on a server at an ISP.
This section contains planning information
for running PPPoE on both clients and access servers. The following
topics are covered:
Planning information for the PPPoE host and access
Explanation of the PPPoE scenario that is introduced
in Example of a Configuration for a PPPoE Tunnel
For tasks about setting up a PPPoE tunnel, see Setting Up a PPP Over Ethernet Tunnel.
Before You Set Up a PPPoE Tunnel
Your preconfiguration activities depend on whether you configure
the client side or server side of the tunnel. In either instance,
you or your organization must contract with a telephone company. The
telephone company provides the DSL lines for clients, and some form
of bridging and possibly an ATM pipe for access servers. In most contracts,
the telephone company assembles its equipment at your site.
Before Configuring a PPPoE Client
PPPoE client implementations usually consist of the following
Personal computer or other system that is used by
DSL modem, which is usually installed by the telephone
company or Internet access provider
(Optional) A hub, if more than one client is involved,
as is true for corporate DSL consumers
(Optional) A splitter, usually installed by the provider
Many different DSL configurations are possible, which
depend on the user or corporation's needs and the services that are
offered by the provider.
Ask questions and identify the following:
Ask the telephone company or ISP for any required setup procedures if you are
setting up a home PPPoE client for an individual or yourself.
Ask management at your company for a list of authorized users if you are setting
up PPPoE clients at a corporate site. If you configure remote PPPoE clients, you might
be responsible for giving users information about adding home DSL equipment.
Run the ipadm show-addr command on each system to determine
which interfaces are available on the PPPoE client.
(Optional) Ask PPPoE client users for their preferred passwords. Or, assign
passwords to the users. Note that this password is used for link authentication, not
for UNIX login.
Before Configuring a PPPoE Server
Planning for a PPPoE
access server involves working with the telephone company that provides
your connection to its data service network. The telephone company
installs its lines, often ATM pipes, at your site, and provides some
sort of bridging into your access server. You need to configure the
Ethernet interfaces that access the services that your company provides.
For example, you need to configure interfaces for Internet access,
as well as the Ethernet interfaces from the telephone company's bridge.
Ask questions and identify the following:
Run the ipadm show-addr command to identify interfaces that are
used for lines from data service network
Ask management and network planners for their requirements and suggestions about
the types of services to provide from the PPPoE server
(Optional) Ask management and network planners for their requirements and
suggestions about the types of services to provide to the consumers.
(Optional) Ask network planners and other individuals at your site who are
responsible for contract negotiations for the host names and passwords that are used
for PAP or CHAP authentication by remote clients, not for UNIX login..
Example of a Configuration for a PPPoE Tunnel
This section contains an example of
a PPPoE tunnel, which is used as an illustration for the tasks in Setting Up a PPP Over Ethernet Tunnel. Though the illustration shows all participants in
the tunnel, you only administer one end, either the client side or
Figure 9 Example of a PPPoE Tunnel
In the sample, MiddleCo wants to provide its employees with
high-speed Internet access. MiddleCo buys a DSL package from Phone
East, which, in turn, contracts with service provider Far ISP. Far
ISP offers Internet and other IP services to customers who buy DSL
from Phone East.
Example of a PPPoE Client Configuration
MiddleCo buys a package from Phone East that provides one DSL
line for the site. The package includes a dedicated, authenticated
connection to the ISP for MiddleCo's PPPoE clients. The system administrator
cables the prospective PPPoE clients to a hub. Technicians from Phone
East cable the hub to their DSL equipment.
Example of a PPPoE Server Configuration
To implement the business arrangement FarISP has with Phone East, the system administrator at
FarISP configures the access server dslserve. This server has the
following four interfaces:
eri0 – Primary network interface
that connects to the local network
hme0 – Interface through
which FarISP provides Internet service for its customers
hme1 – Interface contracted
by MiddleCo for authenticated PPPoE tunnels
hme2 – Interface contracted
by other customers for their PPPoE tunnels
Where to Get More Information About PPPoE