DHCPOptions 43, 55, and 60 and Other Customized Options
Updated on
Aug 21, 2024
Focus
Updated on
Aug 21, 2024
Focus
Table of Contents
End-of-Life (EoL)
The following table describes the option behavior forseveral options described in RFC 2132.
Option Code | Option Name | Option Description/Behavior |
|---|---|---|
43 | Vendor Specific Information | Sent from server to client. Vendor-specificinformation that the DHCP server has been configured to offer tothe client. The information is sent to the client only if the serverhas a Vendor Class Identifier (VCI) in its table that matches theVCI in the client’s DHCPREQUEST. An Option 43 packet can containmultiple vendor-specific pieces of information. It can also includeencapsulated, vendor-specific extensions of data. |
55 | Parameter Request List | Sent from client to server. List of configurationparameters (option codes) that a DHCP client is requesting, possiblyin order of the client’s preference. The server tries to respond withoptions in the same order. |
60 | Vendor Class Identifier (VCI) | Sent from client to server. Vendor typeand configuration of a DHCP client. The DHCP client sends optioncode 60 in a DHCPREQUEST to the DHCP server. When the server receives option60,it sees the VCI, finds the matching VCI in its own table, and thenit 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. |
You can send custom, vendor-specific option codes that are notdefined in RFC 2132. The option codes can be in the range 1-254and of fixed or variable length.
Custom DHCP options are not validated by the DHCP Server;you must ensure that you enter correct values for the options youcreate.
For ASCII and hexadecimal DHCP option types, the option valuecan be a maximum of 255 octets.
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