RRAS: The IPv4 DHCP Relay Agent should be configured with at least one DHCP server

  • 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

IPv4 DHCP Relay Agent is enabled, but is not configured with the IPv4 address of a DHCP server.

Impact

IPv4 DHCP Relay Agent must be configured with the address of at least one DHCPv4 server. Without a DHCP server, DHCP Relay Agent has nowhere to relay DHCP messages from clients.

The IPv4 DHCP Relay Agent listens for DHCP broadcast packets sent on a subnet, and forwards them as a unicast packet to a DHCP server on a different subnet. You must configure the IPv4 address of the DHCP server to which the agent forwards the requests.

Resolution

Use 'Routing and Remote Access' in Server Manager to configure one or more DHCP server addresses on the IPv4 DHCP Relay Agent Properties page.

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

To configure a DHCP server address for the DHCP Relay Agent

  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, expand Routing and Remote Access, and then expand IPv4.

  3. Right-click DHCP Relay Agent, and then click Properties.

  4. On the General tab, type the IPv4 address for the DHCP server in the Server Address box, and then press Add. Add additional DHCP servers for fault tolerance.

  5. Click OK to save your changes.

Additional references

For more information about the DHCP Relay Agent, see Configure the IPv4 DHCP Relay Agent (https://go.microsoft.com/fwlink/?LinkId=156481).

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.