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Linux Bridge+Firewall Mini-HOWTO version 1.1.3
1.  Introduction
2.  What and Why (and How?)
2.1.  What
2.2.  Why
2.3.  How?
3.  BRIDGING
3.1.  Software
3.2.  Prior Reading.
3.3.  Boot configuration
3.4.  Kernel configuration
3.5.  Network addresses
3.6.  Network routing
3.7.  Card configuration
3.8.  Additional routing
3.9.  Bridge Configuration
3.10.  Try it out
3.11.  Checks
4.  FIREWALLING
4.1.  Software and reading
4.2.  Preliminary checks
4.3.  Default rule
4.4.  Holes per address
4.5.  Holes per protocol
4.6.  Checks