Firewalls, Network Address Translation (NAT), and network logging andaccounting are all provided by Linux’s Netfilter system, also known bythe name of the command used to administer it, iptables. The iptablesinterface is the most sophisticated ever offered on Linux and makesLinux an extremely flexible system for any kind of network filteringyou might do. Large sets of filtering rules can be grouped in ways thatmakes it easy to test them and turn them on and off.Do you watch forall types of ICMP traffic–some of them quite dangerous? Can you takeadvantage of stateful filtering to simplify the management of TCPconnections? Would you like to track how much traffic of various typesyou get?
This pocket reference will help you at those critical moments whensomeone asks you to open or close a port in a hurry, either to enablesome important traffic or to block an attack. The book will keep thesubtle syntax straight and help you remember all the values you have toenter in order to be as secure as possible. The listings of alliptables options are divided into those suitable for firewalling,accounting, and NAT. <link removed by moderator>

sheevy,

I don't really understand why you posted this "information" here and now, other than as a place to tack your link onto for some self-promotion (a link which, by the way, has nothing to do with the information in your post).

Such behavior is border-line SPAM.

Since until this point, your other posts have been otherwise normal and acceptable, I'm not giving you any warning other than what I write here and now, but in the future, kindly do not post miscellaneous, advertisement-type stuff like this just to tack on an unrelated link.

Thank you, and kind regards,

Sasha