Nortel BCM 3.7, Manual

Page: 701 / 1004

Point to Point Protocol on Ethernet (PPPoE) 701
Programming Operations Guide
Point to Point Protocol on Ethernet (PPPoE)
The information in this section includes:
• “Settings required for PPPoE”
• “Installing PPPoE”
• “Creating a PPPoE dial up interface”
• “Configuring a PPPoE interface”
• “Connecting to the Internet Service Provider (ISP)”
• “Deleting a PPPoE interface”
PPPoE is the protocol Business Communications Manager uses when connecting to a data network
using a broadband modem. Digital Subscriber Line (DSL) modems and cable modems are
examples of broadband modems.
When the Business Communications Manager uses a PPPoE connection, the Internet Service
Provider (ISP) can control access, billing and other types of service on a per-user, rather than a
per-site basis.
Settings required for PPPoE
The data packets that pass through the PPPoE connection interact with other routing features in
Business Communications Manager. As a result, there are several settings you must make in other
features so those features can use the PPPoE connection.
Note: To use PPPoE, you must have a Business Communications Manager system that
has two LAN cards.
Table 193 Features that interact with PPPoE
Feature Description of interaction
LAN interfaces When you install PPPoE, the LAN1 interface is dedicated to PPPoE. You must not use the LAN1
interface for any other purpose.
IPSec Tunnels To use IPSec tunnels over the PPPoE interface, Business Communications Manager requires a
single known IP address be assigned to the PPPoE interface. If your Internet Service Provider
uses DHCP to assign the IP addresses, the DHCP server must assign the same IP address to the
PPPoE interface every time Business Communications Manager connects.
Internet Clients Clients who want to use the Business Communications Manager PPPoE interface to access the
internet must set their MTU size to a value less than or equal to 1480 bytes, but not less than 1400
bytes.
Software
Keycode You must purchase and install the PPPoE Software keycode before you can install PPPoE. For
information about purchasing the PPPoE Software Keycode, contact your Nortel Networks
representative. For information about how to install the PPPoE Software Keycode, refer to the
Software Keycode Installation Guide that comes with your Software Keycode.