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Vendor Class Identifier (VCI) and DHCP

Introduction

The Vendor Class Identifier (VCI) is a field in the DHCPREQUEST packet that allows DHCP servers to identify the type of device requesting an IP address. This information is used to provide appropriate configuration parameters, such as the IP address, subnet mask, and default gateway.

Determining the VCI

The VCI can be determined by examining the DHCPREQUEST packet using a tool such as Wireshark. The VCI is typically listed in the "Client Vendor Name" field.

Common VCIs

Some common VCIs include:

• WEB MSFT 5 0: Windows computer
• dhcpcd-5 5 6: Android device
• MSFT 50: Microsoft Windows 10
• dhcpcd-556: Android device
• NET 50: .NET 5 runtime

Importance of the VCI

The VCI is important because it allows DHCP servers to provide appropriate configuration parameters for different types of devices. For example, a DHCP server may provide a Windows computer with a different IP address range than an Android device.

Troubleshooting VCI Issues

If you are experiencing problems with DHCP, you can try the following steps to troubleshoot the issue:

1. Ensure that the DHCP server is configured correctly.
2. Check the VCI of the device requesting an IP address.
3. Verify that the DHCP server is configured to provide the appropriate configuration parameters for the device's VCI.