Vendor Specific Information
Sent from server to client. Vendor-specific information that the DHCP server has been configured to offer to the client. The information is sent to the client only if the server has a Vendor Class Identifier (VCI) in its table that matches the VCI in the client’s DHCPREQUEST.
An Option 43 packet can contain multiple vendor-specific pieces of information. It can also include encapsulated, vendor-specific extensions of data.
Parameter Request List
Sent from client to server. List of configuration parameters (option codes) that a DHCP client is requesting, possibly in order of the client’s preference. The server tries to respond with options in the same order.
Vendor Class Identifier (VCI)
Sent from client to server. Vendor type and configuration of a DHCP client. The DHCP client sends option code 60 in a DHCPREQUEST to the DHCP server. When the server receives option 60, it sees the VCI, finds the matching VCI in its own table, and then it returns option 43 with the value (that corresponds to the VCI), thereby relaying vendor-specific information to the correct client. Both the client and server have knowledge of the VCI.