As mentioned earlier in this chapter, Windows Server 2003 supports the use of multilink connections, which enables a client to connect to the RRAS server using multiple, aggregated links. Bandwidth Allocation Protocol (BAP) provides a means for the bandwidth utilization to be dynamic. As bandwidth usage increases, the client can request another connection to improve performance. As bandwidth usage decreases, connections can be dropped to make them available to other clients or reduce connection costs. Enabling multilink and BAP requires a few steps: enable multilink, configure remote access policies, configure the ports, and configure the clients.
First, open the RRAS console, right-click the server, and choose Properties. On the PPP page, select Multilink Connections to allow clients to request multilink connections. Select "Dynamic bandwidth control using BAP or BACP" to enable clients to use BAP/BACP to dynamically manage aggregation. Click OK to close the property sheet.
The second step is to enable multilink in the appropriate remote access policy. The default policy allows all clients to use the settings defined globally for the RRAS server, so enabling multilink and BAP for the server enables it for all remote clients unless modified by a remote access policy. If you want to restrict the use of multilink and BAP to selected users, modify the remote access policies accordingly. Apply one policy for those who require multilink support and a different policy for those who do not.
In the RRAS console, open the Servers branch and click Remote Access Policies. Double-click the policy you want to modify (or create a new one). Click Edit Profile and select the Multilink tab for the policy (see Figure 18-20). Configure the settings based on the following list:
♦ Server settings determine Multilink usage. Select this option to use the global settings defined by the RRAS server.
♦ Do not allow Multilink connections. Select this option to disable multilink for remote clients covered by the policy and limit them to a single connection.
♦ Allow Multilink connections. Select this option to allow remote clients covered by the policy to use multiple connections.
♦ Percentage of capacity/Period of time. Specify the utilization threshold value and duration the server uses to determine when to drop a link.
♦ Require BAP for dynamic Multilink requests. Select this option to require the client to use BAP to manage multiple links. If the client doesn't use BAP, multilink connections are refused and the client is limited to a single link.
Figure 18-20: The Multilink tab
Next, specify the phone number for each port used for multilink connections to enable the server to pass that data to the client when the client requests another link. The client uses the link number to dial the next link. In the RRAS console, open the server, right-click the Ports branch, and choose Properties. Double-click the port for which you need to set the dial-in number, or select the port and click Configure. Specify the phone number in the field Phone Number for This Device and then close the dialog box and the Ports property sheet.
See the section "Configuring Outgoing Dial-Up Networking Connections" later in this chapter to learn how to configure Windows Server 2003 clients to use multilink and BAP.
Figure 18-20: The Multilink tab
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