Firewalls, Network Address Translation (NAT), network logging and accounting are all provided by Linux's Netfilter system, also known by the name of the command used to administer it, iptables. The iptables interface is the most sophisticated ever offered on

Linux and makes Linux an extremely flexible system for any kind of network filtering you might do. Large sets of filtering rules can be grouped in ways that makes it easy to test them and turn them on and off.

Do you watch for all types of ICMP traffic--some of them quite dangerous? Can you take advantage of stateful filtering to simplify the management of TCP connections? Would you like to track how much traffic of various types you get?

This pocket reference will help you at those critical moments when someone asks you to open or close a port in a hurry, either to enable some important traffic or to block an attack. The book will keep the subtle syntax straight and help you remember all the values you have to enter in order to be as secure as possible. The book has an introductory section that describes applications, followed by a reference/encyclopaedic section with all the matches and targets arranged alphabetically.

Much more than a quick list of commands and options, the CVS Pocket Reference, 2nd Edition, is packed with a surprising amount of detail-- including an overview of background concepts, thorough descriptions on how to use and administer a CVS repository, and discussions of CVS-related files and how to manage them-- all in a convenient reference format. It's an absolute must for developers who need an on-the-job guide for quick answers to CVS dilemmas.

The "Linux Network Administrator's Guide," Third Edition dispenses all the practical advice you need to join a network. Along with some hardware considerations, this highly acclaimed guide takes an in-depth look at all of the essential networking software that comes with the operating system--including basic infrastructure (TCP/IP, wireless networking, firewalling) and the most popular services on Linux systems.

But as the follow-up to a classic, the third edition of the "Linux Network Administrator's Guide" does more than just spruce up the basics. It also provides the very latest information on the following cutting-edge services:

Wireless hubs

OpenLDAP

FreeS/WAN

IMAP

Spam filtering

OpenSSH

BIND

IPv6

Featuring a litany of insider tips and techniques, the "Linux Network Administrator's Guide," Third Edition is an invaluable companion for any network administrator interested in integrating Linux into their Windows environment

Authored by Terry Dawson, Tony Bautts, and Gregor N. Purdy, the "Linux Network Administrator's Guide," Third Edition emerged from the Linux Documentation Project (LDP). The LDP's goal is to centralize all of the issues of Linux documentation, ranging from online documentation topics such as installing, using, and running Linux.