Hyper-V - Legacy NIC not getting DHCP address at boot, but when OS loads the NIC gets a DHCP address

Hi, I have a strange issue with DHCP.
I have a lab environment on a single Hyper-v 2012 Server. AD, DNS & DHCP exist on a single virtual machine, I have a flat network 192.168.1.x, all VM's are on this network. I have authorised DHCP and Setup the scope.
A VM has a legacy adaptor, the legacy nic is configured in the boot order as the first device.
When I boot the machine I do not get a DHCP address, however when the OS boots the Legacy NIC then gets a DHCP address??
I need to use a legacy NIC as I need to PXE boot the VM, however I should get an IP address at boot time, which I don't get.
I have run Wireshark on the DHCP server, I can see the legacy NIC do a "DHCP Discover and the DHCP Server respond with a DHCP Offer" however all communication ends there. I have disable all firewalls and I see no reason for this not to work.
I have done tis before with no issues but I am unable to get this to work on this server!!!!!

Hi
According to your description , it is recommended to make sure or do :
        In your environment , there is no any other valid DHCP, BOOTP or proxy DHCP offers.
        Make sure if the DHCP server is overload.
        So suggest to test that creating a new “internal virtual switch” and change the settings of VM which provide DHCP service to connect to the new “virtual switch”.
        Then create a new VM use legacy NIC also connect to the new “internal virtual switch” and try to PXE Boot.
Hope this helps.
Best Regards
Elton ji
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Hyper-V - Legacy NIC not getting DHCP address at boot, but when OS loads the NIC gets a DHCP address

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