This article was previously published under Q296534
This article has been archived. It is offered "as is" and will no longer be updated.
Some broadband (DSL, ADSL) Internet service providers (ISPs) require a special dial-up connection that uses Point-to-Point Protocol over Ethernet (PPPoE). This article describes how to configure Internet Security and Acceleration (ISA) Server to use this type of connection as the primary route to the internet. Please see your ISP's documentation for installation and configuration of the PPPoE software.
In this type of configuration, the ISA Server-based computer is configured with two network adapters (one on the internal network and one connected to the broadband modem) and a dial-up network adapter (the PPPoE adapter).
To properly configure ISA Server, add the dial-up entry, configure the Local Address Table (LAT), and then configure any routes to use the dial-up entry.
Part I: To Add the Dial-Up Entry to ISA Server
Some PPPoE software (such as WinPoet) are represented by a dial up entry. To configure ISA to use this entry for internet access:
In the ISA Management interface, expand Policy Elements.
Right-click Dial-up Entries, click New, and then click Dial-up Entry.
Type a name and description, click the PPPoE dial-up entry by clicking Select, and then specify the appropriate account information (user name and password for the PPPoE connection) by clicking Set Account.
Part II: To Construct the LAT
When you construct the LAT, include only the network adapter that represents the internal local area network (LAN). The inclusion of the network adapter that is connected to the DSL modem does not prevent network access, but it does pose a security risk on the internal network.
Part III: To Configure Routing and Firewall/SecureNAT
The final step is to ensure that both Web and Firewall/Secure NAT clients are routed through the PPPoE connection.