RRAS: If DHCP is used to allocate addresses to remote clients then specify the network adapter to be used to obtain DHCP addresses

  • Article

Applies To: Windows Server 2008 R2, Windows Server 2012, Windows Storage Server 2012

This topic is intended to address a specific issue identified by a Best Practices Analyzer scan. You should apply the information in this topic only to computers that have had the Network Policy and Access Service (NPAS) Best Practices Analyzer run against them and are experiencing the issue addressed by this topic. For more information about best practices and scans, see Best Practices Analyzer.

Operating System

Windows Server 2012, Windows Server 2008 R2

Product/Feature

Routing and Remote Access Service (RRAS)

Severity

Warning

Category

Configuration

Issue

The RRAS server is configured to use DHCP to obtain IP addresses for remote access clients, but the network adapter through which a DHCP server can be accessed has not been specified.

Impact

If an adapter is not specified, RRAS might select an adapter through which DHCP is not available resulting in APIPA addresses. APIPA addresses are not routable. Remote access clients that are assigned an APIPA address cannot communicate beyond the remote access server.

If an interface is not specified as the one through which RRAS can access DHCP, then RRAS picks one at random. If DHCP is not available through the randomly selected interface, then the allocation of IP addresses fails.

Resolution

Use 'Routing and Remote Access' in Server Manager to select an adapter on the Routing and Remote Access Properties page. Select an adapter connected to a network that has an accessible DHCP server.

Membership in the local Administrators group, or equivalent, is the minimum required to complete this procedure.

To specify the interface through which DHCP is accessed

  1. Start Server Manager. Click Start, click Administrative Tools, and then click Server Manager.

  2. In the navigation tree, expand Roles, expand Network Policy and Access Services, then right-click Routing and Remote Access and then click Properties.

  3. On the IPv4, select the network adapter that you want the RRAS server to use to access DHCP, and then click OK.

Additional references

For more information about using DHCP with RRAS, see RRAS and DHCP (https://go.microsoft.com/fwlink/?LinkId=140605).

For more about the Routing and Remote Access role service, see Routing and Remote Access (https://go.microsoft.com/fwlink/?linkid=153482) on TechNet, and Routing and Remote Access Service in the Windows Server Technical Library.