User's Guide

sf Firewall Software--a TCP/IP packet filter for Linux

Version 0.2.9, last edited on November 7th, 1996

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Table Of Contents

  1. Introduction
    1. It's free
    2. Target group
    3. It is documented
    4. It comes with all the source code
    5. It has nifty features
    6. And... It works
    7. How to contact us
    8. Copyright
    9. Bibliography
    10. Essential readings
    11. Recommended readings
  2. Installation
  3. Setting up the Firewall Configuration
    1. Specifying IP Addresses
    2. The Setup Section
    3. The Configuration Section
    4. The Notification Section
    5. Writing Filter Rules
      1. Block or Reject Packets?
      2. Filtering TCP Circuits
      3. Inbound and Outbound Packets
      4. Address Spoofing
      5. Fragmented IP Packets
    6. Syntax of the Configuration File
  4. Examples, Please!
  5. Starting and Controlling the Firewall
    1. Starting the Firewall
    2. Stopping the Firewall
    3. Reconfiguring the Firewall
    4. Checking a Configuration File
    5. Displaying the Current Configuration
  6. Counter Intelligence
    1. Actions of the spy Process
    2. Where the Output is Written to
      1. Example Output
  7. The Log Output Explained
    1. Where Output is Written to
    2. Abbreviations Explained
    3. Other Log Entries
  8. Limits
    1. Present
    2. Protection by the sf Firewall System
    3. Remaining Loopholes


Copyright © 1996 Robert Muchsel and Roland Schmid.

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