I’m noting this here because I always forget how to netboot machines.

Install the dnsmasq daemon:

apt-get install dnsmasq

The relevant /etc/dnsmasq.conf configuration lines are as follows:

interface=eth0
dhcp-range=192.168.25.50,192.168.25.150,12h
dhcp-boot=pxelinux.0
enable-tftp
tftp-root=/var/ftpd

Restart dnsmasq:

service dnsmasq restart

The following needs to be added to /etc/network/interfaces:

iface eth0 inet static
    address 192.168.25.1

Bring up eth0:

ifup eth0

The following sysctl changes are required:

sysctl net.ipv4.conf.all.forwarding=1

The following iptables changes are required:

iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT

Finally, grab netboot.tar.gz from a Debian mirror such as

http://ftp.ca.debian.org/debian/dists/jessie/main/installer-i386/current/images/netboot/

and extract it into the tftp root directory:

/var/ftpd# tar xzvf netboot.tar.gz