Configure Network based installation in Hyper V

If you want to perform PXE boot installation/network based installation for Virtual machine, you need to use legacy network adapter. You can't use synthetic network adapter until you've install integration services.

Legacy network adapter is an emulated device which is primary backward compatibilities with older operating system. If you cannot see network adapter in the VM, switch to legacy network adapter.
It also work on Linux operating system.

Here is the step to change the legacy network adapter:-

1. Shutdown the VM before adding hardware. The VM must be offline.
2. Select the VM and choose the option Settings
2. Choose Add hardware, select legacy network adapter and click Add