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Configuring IPCop Firewalls by James Eaton-Lee, Barrie Dempster

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Topology One: NAT Firewall

Our first topology exists as a drop-in replacement for the many NAT firewalls that exist in the market. In small offices and homes, solutions such as the embedded NAT firewalls sold by D-Link, Linksys, and friends are frequently deployed in order to provide small networks with cost-effective Internet access. Solutions such as Internet Connection Sharing (see http://www.microsoft.com/windowsxp/ using/networking/learnmore/default.mspx for more information on Internet Connection Sharing from Microsoft), a combined NAT firewall, DNS Proxy, and DHCP Server, built into client editions of Windows since Windows 98, are also frequently used in order to allow one PC with a modem or network interface to act as a network gateway ...

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