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I have a T1 connection to my Cisco 2620, along with a public IP block of 255 IP's. I want to block some selected IP's from accessing the outside world
You can do that either by setting up filtering rules on your router or a firewall that is monitoring that connection. You
have a firewall protecting that connection, RIGHT? There are also web filtering products (
, etc.) that can enforce pretty granular policies on what those IP address do on the Internet if you want to provide some access, but control it tightly.