DHCP failure with Intel I219-V

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Are you doing legacy (BIOS) PXE boot or UEFI PXE boot with the Elitebook 840 G3?

If I recall correctly, the HP Elitebook 840 G3 defaults to UEFI mode, which corresponds to UEFI PXE boot (IPv4 and/or IPv6), so a UEFI PXE boot to ipxe.lkrn may not get very far...

I recently have very good luck running ipxe-snponly-x86-64.efi (built using ROM-O-Matic) with several Intel NUC PCs booting with UEFI PXE. When UEFI iPXE loads and my script runs, I see a "link down" line and another line with "TX:0, RX:0" briefly, but then the script quickly moves on to successful sanboot of an iSCSI target, so I've been ignoring those lines indicating the link not working.

Also, I'm using Tiny PXE Server to support iPXE, with proxyDHCP enabled, as I have a wireless router in home network acting as DHCP server. OS is Windows Server 2016.