After OS installation iVentoy blocks DHCP request to main DHCP

[phil2sat]

Did this day testing iVentoy, nice tool so far

What works (internal DHCP):
- PXE asks for DHCP -> gets anwer from main DHCP
- gets IP from main DHCP-Server
- sends iventoy_loader_16000
- asks iVentoy DHCP for new IP

Boot successful
Windows 11 install successful (even with unattend.xml, only partitioning was manual, from boot to login)

BUT after i login to windows i get only the ip from iVentoy-DHCP and therefore i cant access the internet cause of my very complicated DNS setup (gateway and dhcp is 254, nameserver is 1, a pihole-dns)

Conclusion my OpenWRT main DHCP and iVentoy are fighting for the World dominance, not good

Idea use external function from iVentoy but cant get it to boot since i don't know which file i should serve or which options other than 66,67,150 i need to get it to boot.
Next Problem is i have to restart iVentoy after a successful PXE boot, because if in the webgui the device is listed, i get TFTP file not found

FEATURE REQUEST:
- possibility to set a nameserver in DHCP options (option '6')

BUGS FOUND:
- iVentoy does not save gateway...
- iVentoy forgets Auto Install Script settings after Image refresh (nags me hard)

Any Ideas welcome

EDIT: for the interrested, the unattend.xml is attached, have to change to your language values (mine is German), your license key and username+password and maybe Windows 11 version as mine is Pro
Lincense key inside is the official Windows 11 Pro volume key (puplic on Microsoft site)

[longpanda]

When iVentoy is running with External DHCP Server mode, iVentoy will only snop DHCP packets but will not send any response, so the Windows should not get any IP from iVentoy.

[phil2sat]

Unfortunately external isnt working at all
i have the same setup as in  the openwrt thread with same results, if im back home ill grab some wireshark captures. 
what i think, dhcp asks iventoy for loader, gets loader but loader doesn't load http://192.168.1.69:16000/ipxe/MAC_of_Client menu