How to Configure Small Business Server for Dedicated Connection to the Internet (216238)


The information in this article applies to:

  • Microsoft BackOffice Small Business Server 4.0
  • Microsoft BackOffice Small Business Server 4.0a
  • Microsoft BackOffice Small Business Server 4.5
This article was previously published under Q216238

SUMMARY

This article describes the changes necessary to configure a Small Business Server to connect to the Internet with a network interface card (NIC) for a dedicated connection instead of the use of a modem to dial out.

By default, Small Business Server configures a modem-based dial-up connection for connectivity to the Internet. This dial-up connection is also used by Microsoft Proxy Server and Microsoft Exchange Server for bandwidth sharing, and to deliver and receive mail.

It is possible to configure Small Business Server to use a NIC to access the internet in situations where a dedicated permanent connection to the internet is available through a local area network (LAN) based Internet Protocol (IP) Routing device.

MORE INFORMATION

To make Small Business Server use a second NIC to access the Internet, follow these steps:

NOTE: While possible to achieve similar results with only one NIC, it is not advisable because of the inherent security risk to your internal network. This is also not a supported configuration, as far as Proxy Server is concerned.
  1. Install Small Business Server normally with one compatible NIC and modem.
  2. After the installation finishes successfully, shut down the server and add the second NIC along with the appropriate drivers.
  3. Set the network settings:

    1. In Control Panel, double-click Network, click the Protocols tab, select TCP/IP Protocol, and then click Properties.
    2. On the IP Address tab, remove the Default Gateway address of *10.0.0.2 from the internal NIC.
    3. On the WINS Address tab, populate both the primary and secondary WINS addresses for the internal NIC with the *10.0.0.2 address.
    4. On the IP Address tab, select the external NIC from the Adapters drop-down list, and set a valid IP address.
    5. Set the new Default Gateway address to the address of your router.
    6. Add any Domain Name Server addresses that your Internet Service Provider supplies.
    7. Do not populate the WINS server address for this NIC.
    8. Do not turn on IP forwarding.NOTE: This assumes the default IP address of 10.0.0.2 is being used. If the default IP address has been changed, verify the procedure by following information in the following Microsoft Knowledge Base article:

      194562 Change the Default IP Address in Small Business Server

  4. Set the proxy settings:

    1. In WebProxy settings in Internet Service Manager, verify that the external NIC address does not show up in the Proxy's Local address Table (LAT). If the NIC address does, remove it.
    2. Configure Proxy AutoDial not to have a phonebook entry to dial, and clear the dialout credentials.
    3. Disable Proxy Dial on Demand.
  5. Configure Exchange. If the Exchange Internet Mail Service (IMS) is configured to dial out, it will have to be changed to connect through the LAN. Use the following steps to accomplish this:

    1. In the Exchange Administrator program, select the IMS under configuration\connections and press ENTER. This will present the IMS properties screen.
    2. Click the Dial-up Connections tab and click to clear the connection that is selected under the Available Connections section.
    3. Click the Connections tab and verify that the Dial Using check box, located in the Message Delivery section, is not selected.
For additional information, see the following article or articles in the Microsoft Knowledge Base:

164882 Practical Recommendations for Securing Internet-Connections

Modification Type:MajorLast Reviewed:11/19/2003
Keywords:kbinfo KB216238
©2003 Microsoft Corporation. All rights reserved.