DNS Masq

interface is nic connected to network (not internet) /etc/dnsmasq.com

interface=eth0
server=/localnet/172.16.0.254

dhcp-range=172.16.0.100,172.16.0.200,255.255.0.0,12h
dhcp-option=3,172.16.0.254

#block various servers

#Block WoW
address=/us.logon.worldofwarcraft.com/127.0.0.1
address=/us.version.worldofwarcraft.com/127.0.0.1

#Block Pirate Bay
address=/thepiratebay.org/127.0.0.1
address=/www.thepiratebay.org/127.0.0.1