我有一台运行EXSI 6.5和2个VM的服务器，其中一个是配置了FOG Project的Ubuntu 18.04.1 TLS服务器。
我的DHCP服务器是华硕路由器RT-AC68U。
DNSMASQ的配置如下：
# 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
即使已安装并配置了所有组件，我仍然得到PXE-E53：客户端上未收到启动文件名错误。
该怎么办？