--dhcp-option-pxe=[tag:<tag>,[tag:<tag>,]][encap:<opt>,][vi-encap:<enterprise>,]<opt>,[<value>[,<value>]]

A variant of --dhcp-option which defines options only sent in reply to PXE clients. In addition, such options are sent in reply to PXE clients when dnsmasq is acting as a PXE proxy, unlike other options. A typical use-case is option 175, sent to iPXE.