Linux Firewall Tutorial: IPTables Tables, Chains, Rules Fundamentals

[securitybreach]

Iptables firewall is is used to manage packet filtering and NAT rules. IPTables comes with all Linux distributions. Understanding how to setup and configure iptables will help you manage your Linux firewall effectively. Iptables tool is used to manage the Linux firewall rules. At a first look, iptables might look complex (or even confusing). But, once you understand the basics of how iptables work and how it is structured, reading and writing iptables firewall rules will be easy.This article is part of an ongoing iptables tutorial series. This is the 1st article in that series.This article explains how iptables is structured, and explains the fundamentals about iptables tables, chains and rules.

http://www.thegeekstuff.com/2011/01/iptables-fundamentals/

[abarbarian]

Blimey you mean there is more to read up on.

[securitybreach]

that's the best high-level overview i've seen.use a gui frontend.i'd remind folks that screwing with that can cause networking to become, um, notworking.andif you need to open a port,try to limit it to a small range of ip'sand that the port needs to be in and out or, again, notworking.

Good advice :thumbsup:I just use my router to open ports and use Arno's firewall script: https://wiki.archlinux.org/index.php/Firewa...no.27s_Firewall