Configuring Specific IP Addresses with DHCP Offer on Windows Firewall

Configuring Specific IP Addresses for DHCP Offer in Windows Firewall

Dynamic Host Configuration Protocol (DHCP) is a network protocol used to dynamically assign IP addresses to devices on a network. DHCP snooping is a security feature that helps prevent DHCP-based attacks by validating DHCP messages received on a switch. However, if the switches at your university are not activated for DHCP snooping, you may need to configure your Windows Firewall to offer specific IP addresses to devices on your network.

Understanding DHCP Offer in Windows Firewall

Windows Firewall can be configured to offer specific IP addresses to devices on your network using the DHCP Relay Agent service. This service allows Windows Firewall to forward DHCP requests from clients to a DHCP server and receive DHCP offers from the server. You can then configure Windows Firewall to offer specific IP addresses to clients based on their MAC addresses.

Configuring DHCP Relay Agent Service

To configure the DHCP Relay Agent service, follow these steps:

1. Open the Windows Firewall with Advanced Security console.
2. Click on the "Inbound Rules" option in the left pane.
3. Click on the "New Rule" option in the right pane.
4. Select the "Custom" option and click "Next".
5. Select the "All programs" option and click "Next".
6. Select the "UDP" protocol and specify the local port as "67" and the remote port as "68". Click "Next".
7. Select the "Allow the connection" option and click "Next".
8. Select the "Domain", "Private", and "Public" options and click "Next".
9. Enter a name and description for the rule and click "Finish".

Configuring DHCP Offer

To configure the DHCP offer, follow these steps:

1. Open the Registry Editor.
2. Navigate to the following registry key: HKEY\_LOCAL\_MACHINE\SYSTEM\CurrentControlSet\Services\DHCPServer\Parameters.
3. Create a new DWORD value named "DhcpRelayEnable".
4. Set the value of "DhcpRelayEnable" to "1".
5. Create a new DWORD value named "DhcpRelayInformation".
6. Set the value of "DhcpRelayInformation" to the IP address of the DHCP server in hexadecimal format.
7. Create a new string value named "RelayAgents".
8. Set the value of "RelayAgents" to the IP address of the Windows Firewall in hexadecimal format.

Configuring Specific IP Addresses

To configure specific IP addresses for DHCP offer, follow these steps:

1. Create a new text file and name it "Dhcp.ini".
2. Add the following lines to the file:
   [Scope Options] DhcpSubnetMask = 255.255.255.0 DhcpDefaultGateway = 192.168.1.1 DhcpDnsServer = 192.168.1.1 [Address Pool] 192.168.1.100 - 192.168.1.200

3. Save the file in the "C:\Windows\System32\dhcp" directory.
4. Restart the DHCP Server service.

References

• Dynamic Host Configuration Protocol. (n.d.). In Wikipedia.
• DHCP Snooping. (n.d.). In Cisco.
• Configure DHCP Relay Agent. (n.d.). In Microsoft.
• Configure DHCP Server for DHCP Relay Agent. (n.d.). In Microsoft.
• How to configure DHCP for a network. (n.d.). In TechRepublic.