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Windows server2008 DHCP relay agent

DHCP relay agent role:

In a large network, there may be multiple subnets. The DHCP client gets the IP address after getting the response of the DHCP server through the webcast message. But broadcast messages cannot cross subnets. So, if the DHCP client and server are in different subnets, can the client still request an IP address from the server? This requires the use of DHCP relay agents. DHCP relay agent is actually a software technology. The computer with DHCP relay agent installed is called DHCP relay agent server, which undertakes the communication task between DHCP client and server between different subnets.

A relay agent is a Mini Program that transfers DHCP/BOOTP messages between clients and servers on different subnets. According to the consultation document (RFC), the DHCP/BOOTP relay agent is part of the DHCP and BOOTP standards and functions.

Experimental Topology Diagram (GNS3)

Topological structure

Set up the experimental environment (VMware workstation)

1. One Windows2008 (DHCP server)

two。 One Windows2008 (DHCP relay agent)

3. A WindowsXP (client)

4. A Win7 (client)

The steps of the experiment:

Step 1: configure IP for "DHCP server"

Configure two network cards and IP for DHCP Relay Agent.

Step 2: install the DHCP service on the "DHCP server" and configure the above IP address pool.

Step 3: add the role "Network Policy and access Service" to "DHCP Relay Agent"

Step 4: wait for installation.

Step 5: after the installation is successful, click the close button.

Step 6: configure trunk routing.

1. Click to start → management tools → routing and remote access.

two。 The routing and remote access window pops up.

3. Right-click 'Local computer' and select 'configure and enable routing and remote access'.

4. Click 'next'.

5. Select Custom configuration and click next.

6. Select 'LAN routing' and click 'next'.

7. Click the 'finish' button to complete the preliminary configuration.

8. Click 'start Service' and wait for initialization to complete.

9. Configuration items have been added to the management window.

10. Expand 'IPv4', right' 'General' and select 'add routing Protocol'.

11. Select DHCP Relay Agent and click OK.

twelve。 Add to the finish.

13. Right-click 'DHCP Relay Agent' and select 'add Interface'.

14. Select the interface for the Relay Agent, and here select Local connection 2.

Click OK.

15. Check 'Relay DHCP packets' and click'OK'.

16. Specify the agent target (for which server to relay the agent)

Right-click 'DHCP relay agent' and select 'Properties'.

17. Add the target IP. Click 'apply' and click'OK'.

18. The DHCP relay agent has been configured.

Test results:

L DHCP server

Scope 192.168.1.0 lease situation

Scope 192.168.2.0 lease situation

L XP client

L Win7 client

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