Talk:LPI Linux Certification/Advanced Network Configuration & Troubleshooting

First of all I'm very impressed by the fine quality of the material.

It seems as a figure is missing. in the presentation of the firewall mechanism. This is right after the quoted text :  "the packet flow diagram looks like :"

Could the missing picture be something like the ascii-art in iptables-howto

 5. How Packets Traverse The Filters

The kernel starts with three lists of rules; these lists are called firewall chains or just chains. The three chains are called INPUT, OUTPUT and FORWARD.

This is very different from how the 2.0 and 2.2 kernels worked!

For ASCII-art fans, the chains are arranged like so:

_____                  /     \ -->[Routing ]--->|FORWARD|---> [Decision]    \_____/        ^ |                       |         v                       ____ ___                    /    \        /   \                   |OUTPUT| |INPUT|                  \____/ \___/                     ^             |                        |          > Local Process 

Best regards kaj

kaj@superusers.dk