In the last post I walked you through a script to create a stateful packet inspection firewall. Which allowed out-going traffic to the internet, but which blocked in-coming traffic. In this part I’m going to explain how to open up specific ports (or holes). To allow certain types of internet traffic successfully through. As […]
Welcome back to this the second part of the discussion about IPtables, if you missed the first part you can find it here. As mentioned previously, I plan to get into some basic usage and hands-on practice. A few notes before we get started. Firstly: IPtables from the CLI requires root or administrative access for […]
How to use IPTables. What is IPTables? – Part 1 Many people may not be aware but Linux and many unix like operating systems have a firewall built into it, which is most commonly known as iptables. Unlike most consumer-based firewalls, iptables is CLI or command line interface based. Although there are a variety […]
In this article I will explain a few common and useful utilities for network and operating systems in general. Netstat The main purpose of netstat is to give a quick general overview of the connections the system is using. Plus information such as, the protocol typically TCP/UDP or the current status state.
1) First download the puTTY client by visiting: http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html Note: there are various versions with multi functions. For most people puTTY.exe (first one listed) is the one you want. 2) Once the file has been download, double click the EXE file. PuTTY will automatically launch the main configuration (no installation is required) […]
How to build a rack server If you have ever built or upgraded a personal computer. Then building a rack mounted server is very similar with some minor differences as seen in this article. One of the more important aspects being the hardware that you ultimately decide to use, which can affect the overall […]
How to install CentOS 5.x – Image tutorial This basic tutorial will show you how to set up a CentOS5.x (CentOS5.5). Once you have completed this tutorial. You should hopefully have a basic up and running system. I would like to point out that this is not a concrete or the only method […]