Hi @acsel10
Welcome to our Great community !
You could try to modify /etc/dnsamsq.conf in option 66 and paste your exteral PXE server.
If not try to use this manual
http://www.richud.com/wiki/Network_iPXE_dnsmasq_Examples_PXE_BOOT
↧
Nethserver DHCP configuration using WDS PXE
↧