interfaces file:

iface eth0 inet static
   address 192.168.10.254
   network 192.168.10.0/11
   netmask 255.255.255.0
   broadcast 192.168.10.255
auto eth0

dnsmasq config file:

# deactivate DNS
port=0
# listen on specific interface and/or address
interface=eth0
listen-address=192.168.10.1
bind-interfaces
no-resolv
## DHCP configuration
dhcp-range=192.168.10.50,192.168.10.150,12h
# detect PXE clients
dhcp-vendorclass=set:pxe,PXEClient
# MACs we serve
dhcp-host=00:80:64:54:e9:d4
# do not send default route and DNS server options
dhcp-option=option:router
dhcp-option=option:dns-server
# ignore request from unknown hosts
dhcp-ignore=tag:!known
# and ignore non-PXE booting
dhcp-ignore=tag:!pxe
## TFTP configuration
enable-tftp
tftp-root=/svr/tftp
dhcp-boot=/svr/tftp/fdos.144