DnsMasq proxyDHCP does not work on UEFI environments:
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2015q4/009907.html
EDITEDIT_1 if you are using the new DnsMasq with UEFI suport then try adding the missing architecture 9
dhcp-match=set:EFI_ x86-64, option:client-arch, 9 UEFI 64 clients also use 9 as architecture.
EDIT_2
please base your config on this one
# Don't function as a DNS server: port=0 # Log lots of extra information about DHCP transactions. log-dhcp # Set the root directory for files available via FTP. tftp-root=/tftpboot # Disable re-use of the DHCP servername and filename fields as extra # option space. That's to avoid confusing some old or broken DHCP clients. dhcp-no-override # The boot filename, Server name, Server Ip Address dhcp-boot=bios/pxelinux,,192.168.1.200 # PXE menu. The first part is the text displayed to the user. The second is the timeout, in seconds. # pxe-prompt="Booting PXE Client", 1 # The known types are x86PC, PC98, IA64_EFI, Alpha, Arc_x86, # Intel_Lean_Client, IA32_EFI, ARM_EFI, BC_EFI, Xscale_EFI and X86-64_EFI # This option is first and will be the default if there is no input from the user. # PXEClient:Arch:00000 pxe-service=X86PC, "Boot BIOS PXE", bios/pxelinux # PXEClient:Arch:00007 pxe-service=BC_EFI, "Boot UEFI PXE-BC", efi64/syslinux.efi # PXEClient:Arch:00009 pxe-service=X86-64_EFI, "Boot UEFI PXE-64", efi64/syslinux.efi dhcp-range=192.168.1.200,proxy,255.255.255.0 Source https://wiki.fogproject.org/wiki/index.php?title=ProxyDHCP_with_dnsmasq (Adding UEFI support to the basic script)