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Try to use the DHCP Tool and set the fix IP in Windows to 169.254.1.1 and use the same IP in the DHCP Tool.
Looks like 169.254.1.1 - 255
That worked for me to make the Car visible in ZGW Search and should work with the DHCP Server too.

But there is an official Problem with Windows 10 and ISTA/P

Code:

Important!  
When programming Ethernet control units using ISTA/P on computers running Windows 10 as the operating system, programming aborts can occur.  
Background:  ISTA/P is presently not compatible with the Windows 10 operating system and has also not been approved for Windows 10.
Affected vehicles: In F-series, the control unit NBT_Evo.  For G11, G12, the following Ethernet control units are affected: NBT, ATM, FRR, SAS, ICAM, KAFAS, RSE, KOMBI
Measure/workaround: Do not update to Windows 10