For debian squeeze
<<
apt-get install tftpd-hpa isc-dhcp-server bind9

cd /srv/tftp
wget http://ftp.nl.debian.org/debian/dists/squeeze/main/installer-amd64/current/images/netboot/netboot.tar.gz
tar xfz netboot.tar.gz
#OR# wget http://ftp.nl.debian.org/debian/dists/testing/main/installer-amd64/current/images/netboot/netboot.tar.gz

# tail -3 /etc/network/interfaces
allow-hotplug eth0
#NetworkManager#iface eth0 inet dhcp
iface eth0 inet manual

# tail -1 /etc/default/isc-dhcp-server
INTERFACES="eth0"
# tail /etc/dhcp/dhcpd.conf
subnet 10.0.0.0 netmask 255.255.255.0 {
  option routers 10.0.0.5;
  option domain-name-servers 10.0.0.5;
  range 10.0.0.10 10.0.0.20;
  filename "pxelinux.0";
  next-server 10.0.0.5;
}

ip a add 10.0.0.5/24 dev eth0
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING  -o wlan0 -j MASQUERADE
iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT
#iptables -A INPUT -i eth0 -j ACCEPT

/etc/init.d/isc-dhcp-server restart
/etc/init.d/bind9 restart

plug machine on eth0 and boot