أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Hi,
You can use firwalls to block websites and control every thing related to the internet in your network.
Regards,
You can use many technics, such as firewalls, personally i use Cyberoam CR35iNG firewall.
through Different method one of them ISA server