Let's assume for today we need a low cost yet highly functional router and firewall combination for a small office or medium sized business that offers Internet services such as email to its small network of employees and web services such as a web server serving web pages to its customers. The following paper describes the different tools that can be used in setting up an appropriate router and firewall combination using Linux that offers the necessary functionality and security to its users as well as the means to monitor it by an administrator. What follows is not a how-to but an outline to take "reasonable care" following due diligence in providing network security in an environment that requires it.
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