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

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You can do that either by setting up filtering rules on your router or a firewall that is monitoring that connection. You do have a firewall protecting that connection, RIGHT? There are also web filtering products (WebSense, SurfControl, Webwasher, 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.

This was first published in July 2006

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