This paper describes, hopefully, a fairly typical small office/business scenario and one method to connect it securely to the Internet using a commercially available firewall/router, the Cisco 837 ADSL router. A summary of the relevant security features of the router is provided and a step-by-step explanation of the required configuration to use these features to their maximum-security effect. Finally some results are provided of a before and after scan performed on the network using the security scanning tool nmap. The paper is intended to provide a template and example for current recommended practices.
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