What is a DHCP Relay Agent?
A DHCP Relay Agent allows DHCP clients in a different network subnet to lease IP addresses from a DHCP server in a another network. DHCP clients can only lease IP addresses from a DHCP server in its subnet. However, by installing a DHCP Relay agent, clients in other subnets can lease addresses.
In Windows Server 2016, Remote Access role is required to configure DHCP Relay Agent.
In this tutorial you will learn how to:
- Install Remote Access (RRA) Role in Windows Server 2016
- Configure Routing and Remote Access
- Configure DHCP Relay Agent
A DHCP server with a working scope is required. This is NOT covered in this guide.
Install Remote Access Role in Windows Server 2016
To install Remote Access:
- Log on to the server and open Server Manager.
- Then click Manage and select Add Roles and Features.
- On the Before you begin screen, click Next.
- Select Role-based or feature-based installation and click Next.
- Next, on the Select Destination server page, select the server you wish to install Windows Deployment Services Role.
- On the Server Role page, check the box beside Remote Access then click Next.
- On the Select Features page, click Next.
- Then on the Remote Access page, click Next.
- On the Select Role service, check the box beside Routing. A window pops asking whether to add features required for routing? Click Add Features.
- You are returned to the Select role services page. Confirm that DirecttAccess (RAS) and Routing roles are selected. Then click Next.
- On the confirmation page, review the features you selected. Then click Install.
To Prepare for DHCP Relay Agent Configuration, Configure Routing and Remote Access.
Before you configure DHCP Replay Agent, you have to configure Routing and Remote Access first.
Follow the steps below:
- From Server Manager, click Tools, then select Routing and Remote Access.
- On the Routing and Remote Access MMC, right-click your server then click Configure and Enable Routing and Remote Access.
- On the Welcome page, click Next.
- The Configuration page opens. Select the last option, Custom Configuration. Then click Next.
- On the Custom Configuration page, check the box beside LAN routing. Click Next. Then on the confirmation page, click Finish.
- A pop up appears prompting you to start Routing and remote access service. Click Start Service. Then wait for the service to start.
- Routing and Remote Access is now Configured. We are now ready to set up DHCP Relay Agent!
Configure DHCP Relay Agent
- Expand IPv4, then right-click General and select New Routing Protocol.
- On the New Routing Protocol window, select DHCP Relay Agent. Then click Ok.
We are not done yet. Next step is to select the network interface.
- Right-click DHCP Relay Agent and select New Interface.
- On the New Interface for DHCP Relay Agent, select the network interface. Then click Ok.
Your network interfaces may be different. It will depend on the names of the network cards you have on the server.
- When you click Ok in the last task, the properties of the network interface card opens for configuration. Accept the defaults then click Ok.
Hop-Count Threshold: The total number of devices that the packets should pass through as they travel from the source to the destination. In this instance the hop-count defines the number of DHCP Relay Agents the DHCP traffic is allowed to hop through.
Boot threshold (seconds): The number of seconds the relay agent ways before forwarding the message.
There you have it. Clients can now lease IP address from DHCP server outside their own network.
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