The overwhelming majority of Spam, Malware, and DDoS attacks come from countries outside the United States and from infected machines in global Botnets. Often, the best place to block unwanted IP traffic is at the network perimeter. This is traditionally done with firewalls or routers by implementing large access control lists (ACLs). This whitepaper quantifies the performance impact on network latency, TCP connections, and administrative costs of configuring ACLs into entry-level routers and firewalls.

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