hello all i have made a server which is acting as a dhcp,dns and internet gateway in scientific linux 4.5. Now i want my clients won't access some websites such as orkut,facebook etc . Also i don't want to use proxy. Please help me . thanks and regards -- Vivek Chalotra GRID Project Associate, High Energy Physics Group, Department of Physics & Electronics, University of Jammu, Jammu 180006, INDIA.