The vendor-encapsulated-options option can contain either a
single vendor-specific value or one or more vendor-specific
suboptions. This option is not normally specified in the DHCP server
configuration file - instead, a vendor class is defined for each
vendor, vendor class suboptions are defined, values for those
suboptions are defined, and the DHCP server makes up a response on
that basis.
Some default behaviors for well-known DHCP client vendors (currently,
the Microsoft Windows 2000 DHCP client) are configured automatically,
but otherwise this option must be configured manually.