Microsoft KB Archive/169637

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XCON: Demand-dial Connectors using Routing and RAS

Article ID: 169637

Article Last Modified on 10/28/2006


  • Microsoft Exchange Server 5.5 Standard Edition
  • Microsoft Exchange Server 4.0 Standard Edition
  • Microsoft Exchange Server 5.0 Standard Edition
  • Microsoft Routing and Remote Access Service Update for Windows NT Server 4.0

This article was previously published under Q169637


Microsoft Routing and Remote Access Service (RAS) provides normal RAS functionality as well as demand-dial network connectivity. Thus, Routing and Remote Access can be used to dynamically connect Microsoft Exchange Server computers via RAS, X.400 Connector, or Site Connector using the demand-dial feature of Routing and Remote Access. The demand-dial X.400 connector may increase cost of the connection and requires minor modifications to the default connector override settings. Because there is no scheduling ability with the site connector, it will hold the connection open as long as possible.

Configuring Routing and Remote Access for demand-dial is covered in detail in Chapter 4 of the "Routing and Remote Access Administrator's Guide" included with the download package. Use the helpful hints listed below with the information in the administrator's guide to configure demand-dial for your Microsoft Exchange Server.


Any default gateway defined in the TCP/IP configuration on the Routing and Remote Access server should be removed. This server is now a router and all routes must be manually defined or configured to use RIP of OSPF for dynamic updates. Default routes can be used as long as their impact is fully understood.

When creating a demand-dial interface, the name of the interface must match the name of the account that is added to the accounts database of the remote router. This is, in effect, a service account for the router. For more information on configuring demand-dial interfaces, please see the "Administrator's Guide" or the following article in the Microsoft Knowledge Base:

159684 Configuring Routing and Remote Access Dial-up Interfaces

When prompted to enter the phone number or IP address of the remote router, enter the phone number of the remote server. The remote network will be defined as a route.

Network routes are defined by a network ID, subnet mask, gateway address, interface, and metric. For example, is a network ID using a subnet mask of The gateway address will be the address of the dial-up interface on the remote router. This address will be determined by the network configuration you provide in the Routing and Remote Access Port Configuration (in the Network settings dialog box). If you are using a static pool of address, the first IP address is excluded from the range of available IP addresses. You must create a static route for the remote network that uses the demand-dial interface.

Configure the X.400 Connector as if it were making a LAN connection and make the following modifications on the Override tab of the connector.

  1. In the Association Parameters section, adjust the Lifetime (sec) value and the Disconnect (sec) to a value of 15. This minimizes the amount of time the connection is maintained after network traffic has ceased.
  2. In the Connection Retry Values section, adjust Max Transfer Retries to a value of 5. Testing has shown that the connection may require more than the default of 2 attempts to complete successfully.
  3. Adjust the Open Interval (sec) value to 15. This minimizes the amount of time the MTA will wait before it attempts to reestablish a lost or disrupted association.
  4. For the Site Connector, simply configure it as if you were on a local LAN segment.

Additional query words: X.400 demand-dial router rras

Keywords: kbnetwork kbsetup kbusage KB169637