How to secure my firewall

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Building a Bridging Firewall with Linux

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This documentation discusses how one can use the Linux kernels v2.2 and higher to setup Ethernet bridging and also explains the steps necessary to get a bridging firewall up and running. In a bridge, all packets received by one interface are passed t

Build a Floppy Firewall

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This documentation will teach you how to turn an unused PC into a packet-filtering firewall using a package called floppyfw. The firewall boots off a single floppy, runs completely in RAM, and uses ipchains for the filter rules. It also does IP masqu

Testing Your Firewall

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This document describes some procedures for testing your firewall implementation. It asks several questions that should help in determining if your firewall is working the way you expect.