for linux:sudo iptables -A INPUT -s 173.194.55.0/24 -j REJECT
sudo iptables -A INPUT -s 206.111.0.0/16 -j REJECT
for mac:sudo ipfw add reject src-ip 173.194.55.0/24 in
sudo ipfw add reject src-ip 206.111.0.0/16 in
for windows:
netsh advfirewall firewall add rule name="YouTubePerformanceHack" dir=in
action=block remoteip=173.194.55.0/24,206.111.0.0/16 enable=yes