IP Masquerading

sudo apt-get install iptables
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -s 192.168.2.0/24 -o eth0 -j MASQUERADE

The diskless nodes should be set up so that 192.168.2.1 is their
default gateway.

eth0 = 192.168.2.1