Systems Administration (SysAd) and Digital Security are two huge categories that are both hugely important in the modern world. SysAd ranges from compiling modules, configuring Apache webserver, updating servers and networking remote computers. Digital security, one of the most interesting aspects of the digital world, will see topics for everything from configuring firewalls, detecting security breaches, handling exploits, calculating risk and detecting threat vectors. I’m hugely interested in SysAd and security, as I see them both as critical aspects of entire businesses.

Both SysAd and Security Individuals are in a constant arms race with malicious users and automated bot nets. As new tools to protect servers and systems are produced and rolled out, new ways to circumvent them are developed. As hackers find new ways to breach systems and services, security aficionados and clued up  system administrators patch, program and research their ways back to securer grounds.

What is a UDP Flood Attack (DoS)

by Paul Joyce

A User Datagram Protocol flood attack is a type of denial of service attack (DoS) which relies on the basis that UDP connections are stateless. We recently discussed about TCP SYN attacks being used to DoS targets; now we’re talking about UDP which doesn’t work on the 3 way handshake of TCP. One benefit of […]

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How to do Port Scanning with Nmap

by Paul Joyce

Network Mapper, usually just known as Nmap, is a powerful yet compact tool to have in your arsenal, giving you the power to explore a network and scan ports of various targets you find. Network and system administrators should know about this tool, its very helpful in debugging certain networking problems. It is however predominantly […]

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Vulnerability Scanners Vs Penetration Tester

by Paul Joyce

While browsing forums and articles it seems there’s some confusion over the distinction between vulnerability scanners and penetration testers. What do these two digital security roles have in common, where do they overlap and where do they differ. Vulnerability scanners and penetration testers should both have written or implied permission to perform both of their […]

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How to remember the OSI 7 model in order

by Paul Joyce

Remembering the OSI 7 Model – Mnemonics The order that the different layers of the Open Systems Interconnection 7 model are found in matters hugely; needless to say you in certain IT roles you cant afford to forget where the data link layer occurs, or which layer comes before another, etc. Remembering the correct order […]

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What is a TCP SYN Flood Attack (DoS)

by Paul Joyce

Today we’re looking at a specific type of DoS attack; the SYN flood denial of service attack. Although this type of attack can just as equally be performed as a DDoS attack, the examples we’ll use are for a standard single-source denial of service. A SYN-flood attack works by consuming resources on the targets machine […]

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Explaining Denial of Service Attacks

by Paul Joyce

Denial of Service attacks (DoS attacks) are rather simplistic in nature and devilishly easy to launch. In their simplest form against a well patched and updated system they don’t usually pose too much of a threat, however like most things they have bigger and more dangerous brothers out there. Sometimes its hard to explain a […]

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Information on Layers of the OSI-7 Model

by Paul Joyce

What is the OSI-7 model? The Open-System Intercommunication model describes how the network communication layers are distinct and separate from one another. There are a few different network layer models, however this article only talks about the OSI-7 model. The OSI-7 model breaks the communication layers as follows (The physical layer is called the bottom […]

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How to use Linux’s Traceroute (3 Examples)

by Paul Joyce

Connections over a network often need debugging but due to the nature of the networking-beast, the actual topography of the network may be unknown. Connections are usually perceived as going from A to B, for example your desktop computer connects to Amazons website. To help expose the exact topography of a network we can use […]

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Raspberry Pi Day3: Configuring and connecting securely and remotely with SSH

by Paul Joyce

The other day I managed to mount the Raspberry Pi OS image onto an SD card and the Pi had its first taste of life. Now I’m going to attempt to set-up remote secure connections to the Pi so I can do away with the keyboard, mouse and monitor attached to the experimental hobby PC. […]

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Linux: Changing your password from the CLI

by Paul Joyce

We all know that passwords are some of the most important pieces of information we have to remember, but on top of that we’re told we should change them regularly. This is all well and good, but do you know how to change your Linux password when you can’t get into the X windows manager? […]

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