# set tag "ENH" if request comes from iPXE ("iPXE" user class)
dhcp-userclass=set:ENH,iPXE

# alternative way, look for option 175
#dhcp-match=set:ENH,175

# UNDI
dhcp-boot=tag:!ENH,netboot.xyz-undionly.kpxe,myserver,192.168.0.231

# PXE
dhcp-boot=tag:ENH,netboot.xyz.kpxe,myserver,192.168.0.231