I have a server running EXSI 6.5 with 2 VM’s, where one of them is a Ubuntu 18.04.1 TLS Server with FOG Project configured.

My DHCP Server is and Asus Router RT-AC68U.

DNSMASQ is configured as follow:

# 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=undionly.kpxe,,192.168.1.120

# PXE menu.  The first part is the text displayed to the user.  The second is the timeout, in seconds.
pxe-prompt="Booting FOG Client", 10

dhcp-range=192.168.1.120,proxy

It’s all installed and configured and I still get a PXE-E53: No boot filename received ERROR on the clients.

What can I do to solve this?