Article ID: 296534 - View products that this article applies to.
This article was previously published under Q296534
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 ServerSome PPPoE software (such as WinPoet) are represented by a dial up entry. To configure ISA to use this entry for internet access:
Part II: To Construct the LATWhen 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/SecureNATThe final step is to ensure that both Web and Firewall/Secure NAT clients are routed through the PPPoE connection.