The Guide to IP Layer Network Administration with Linux was conceived as a project to document and provide examples for the use of Linux-specific IP networking tools.
The book includes coverage of the following topics: network address translation (NAT), address resolution protocol (ARP), routing, and masquerading. There is a nascent section on bridging, although the focus of the documentation is the use of layer 3 Linux technologies.
Modeled after documents hosted at TLDP, this effort is a contribution to the Linux community undertaken of free will and in free time. I intend to release the completed guide to TLDP for inclusion in the documentation repository.