Hello I know that the preferred way of controlling access is to use whitelists, but for my case I'd like to use IP blacklisting. Now using a script like #!/bin/bash if [ -f badips.txt ] then for BAD_IP in `cat badips.txt` do iptables -A INPUT -s $BAD_IP -j DROP done else echo "Can't read badips.txt" fi I have like 96 banned IPs so far. I am wondering about the possible performance hit on my system, and the limits of iptables. What if I have thousands? -- Michael Yep Development / Technical Operations RemoteLink, Inc. 26W161 Plank Rd Naperville, IL 60563-3422 Website: www.remotelink.com Direct: 800-362-9446 x164 Fax: 630-983-0364 GPG Key 0x126439D9 Your Link to Effective Business Communications! Specializing in telecommunications and Internet technology. If it helps connect you with your customers, remote employees and colleagues we do it. We put you in control of today’s technology. From Teleconferencing, WebConferencing, Auto Attendant and Broadcast messaging to Custom data collection, ecommerce, CTI and IVR services.