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What is a dhcp client windows 10 code#
The structure is pretty simple: the first byte contains the option code 43, the second byte the length of the package followed by one or more options.Įach option i n (i1, i2, etc) has same basic structure: the first byte contains the options code, the second byte the length of the package followed by the value of the option. ĭHCP Option 43 – Vendor Specific InformationĭHCP option 43 is described in RFC2132, it explains how the packet of the option needs to be send.
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As described above, the value of the DHCP option is only sent to clients that have a specific vendor class (MSFT 5.0 in the example). The DHCP option we’re interested in is option 43 Vendor Specific Information. What’s interesting to know is that the DHCP server only returns the options the DHCP client requested via option 55 in its DHCP Discover packet.
What is a dhcp client windows 10 mac#
The lease contains IP information (the offered IP, relay agent, DHCP server), MAC addresses, options and some other stuff.
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Īfter a DHCP server receives a DHCP Discover it returns a DHCP Offer to the DHCP client containing the DHCP lease. PS: The default vendor class in your Microsoft Windows DHCP client can be changed to obfuscate your OS, but its unsupported – see this link. Since this is a broadcast all DHCP servers (and other machines sniffing the package) know this is a “Microsoft Windows 2000 client” and only DHCP options for this vendor should be sent. In the first stage of a DHCP request, the DHCP Discover, a client adds the predefined vendor class in DHCP option 60 (or Vendor Class Identifier).įor Windows 2000 and above (Vista / 7 / 8 / etc.) “MSFT 5.0” is send. In a Microsoft DHCP server the vendor classes for Windows Windows machines are built-in, others can be added via the context menu of the protocol stack (IPv4 or IPv6) and selecting Define Vendor Classes. Microsoft claimed three vendor classes where the “MSFT 5.0” is the most used since it overrules “MSFT” (and the market share of Windows 98 is around 0.01% ). “MSFT” for all Windows 98, Me and 2000 clientsĪs you can see there’s no naming convention or regulation around the vendor class, but the implementation seems clear.“MSFT 98” for all Windows 98 and Me clients.“MSFT 5.0” for all Windows 2000 clients (and up).“alcatel.noe.0” for an Alcatel IP touch phone.IP Phone CP-7940” for a Cisco Unified IP Phone 7940G The vendor class is used by DHCP clients to optionally identify the vendor and configuration.
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In this article I’ll explain how this mechanism works and how you can send Microsoft Windows specific DHCP options from a non-Microsoft DHCP server (like a Linux or Lucent-Alcatel VitalQIP appliance). Since this applications only run on Microsoft Windows its no more than logical to only send this option to Windows clients. Some applications use the content of a DHCP option to receive configuration data, for example Microsoft Lync or RES Workspace Manager. Microsoft clients are out-of-the-box prepared to receive Microsoft Windows specific options while Microsoft DHCP servers have the ability to send DHCP options only received by Windows clients. DHCP servers can send vendor specific options to clients to granularly control configuration.