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‘howto’ Archives

HOWTO: Block brute force attacks on your SSH server

HOWTO: Block brute force attacks on your SSH server

You have probably seen very simple iptables rules to do this. This is a little bit better. -A INPUT -i eth0 -p tcp -m tcp --dport 22 -m state --state NEW -m recent --set --name SSH --rsource -A INPUT -i eth0 -p tcp -m tcp --dport 22 -m recent --rcheck --seconds 30 --hitcount 4 --rttl --name SSH --rsource -j REJECT --reject-with tcp-reset -A [...]

HOWTO: Create a shell script to monitor load average on a Linux server

HOWTO: Create a shell script to monitor load average on a Linux server

Load Average on a server reflects the current state of the server. Higher the load average, poorer is the server performance hence it is a necessity to monitor the load average on the server. The following shell script monitors the load average on the Linux server and inform the server administrator with the current running processes of the server [...]

HOWTO: Move your logs and temp files to RAM

HOWTO: Move your logs and temp files to RAM

While working with netbooks and other portable computers over the years I have always looked for new ways to improve battery life, but I have also been concerned with maximizing performance of these small systems. Today I would like to share with you a simple trick to improve performance and the overall "feel" of your computer. To improve [...]

HOWTO: Silence vuvuzela drone on your TV

HOWTO: Silence vuvuzela drone on your TV

If watching the World Cup has you feeling like you live in a building filled with enraged, sleepless bees, you can try filtering out the vuvuzelas' distinctive dentist-drill whine, using a computer or a TV with a good equalizer: For the Vuvuzela-killer, we need only a high-slope band stop filter that takes out the corresponding frequencies. [...]

HOWTO: Sniff Out a Liar and Become a Human Lie Detector

HOWTO: Sniff Out a Liar and Become a Human Lie Detector

Have you ever been burned by somebody because they told you an outright lie? It can happen in your personal or business life-you’re on cloud nine when your girlfriend says she loves you, only to find out later she’s been cheating on you for months; a client says their business is solvent, but they end up bankrupt, and you lose a ton of money [...]

HOWTO: Linux SAN Multipathing

HOWTO: Linux SAN Multipathing

There are a lot of SAN multipathing solutions on Linux at the moment. Two of them are discussed in this blog. The first one is device mapper multipathing that is a failover and load balancing solution with a lot of configuration options. The second one (mdadm multipathing) is just a fail-over solution with manual re-enable of a failed path. [...]

HOWTO: Disable Copy-and-Paste Hijacking Web Sites

HOWTO: Disable Copy-and-Paste Hijacking Web Sites

Over the last few months I’ve noticed an annoying trend on various web sites, generally major newspaper and magazine sites, but also certain blogs. What happens is that when you select text from these web pages, the site uses JavaScript to report what you’ve copied to an analytics server and append an attribution URL to the text. So, for [...]

HOWTO: Play Pandora streaming radio in Linux – UPDATE

HOWTO: Play Pandora streaming radio in Linux – UPDATE

Update from this older post. The process is MUCH easier now. Download Adobe AIR from here. chmod +x AdobeAIRInstaller.bin to make it executable. The type ./AdobeAIRInstaller.bin to start the install. Download Pandora.air from here. (It is no longer offered for free on Pandora.com) Open up the Adobe Air install GUI and it will prompt you [...]

HOWTO: Add a progress bar to Linux shell commands

HOWTO: Add a progress bar to Linux shell commands

How many times have you wished there was an easy way to view the progress of a gzip? a grep? redirected file read/writes? file copies? There are many situations where the addition of a simple progress bar would make the user experience 1 million times more bearable. Several years ago I had read about pipe viewer, or pv for short. This is truly the [...]

HOWTO: Jailbreak iPhone 3GS 3.1.3 with Spirit

HOWTO: Jailbreak iPhone 3GS 3.1.3 with Spirit

Spirit jailbreak is now officially available for all iDevices. This untethered jailbreak tool supports iPhone 3.1.2 as well as iPad 3.2 operating system. Hacker has also been confirmed that Spirit jailbreak is safe for latest iTunes 9.1.1 version. Jailbreaking process is very easy provided that one must use following guide to understand important [...]

HOWTO: Defeat a sliding chain lock with a rubber band

Sliding chain lock, meet rubber band.

HOWTO: Spot a handgun, the beautiful information edition

HOWTO: Spot a handgun, the beautiful information edition

Back in 2007, Edward Tufte featured Megan Jaegerman's NYT graphic on spotting a hidden handgun (click through below for the whole thing). It's not only informative, it's also beautiful. The same page features many of Jaegerman's other NYT graphics, each a little work of information art. (more…)

HOWTO: Get a free Encom ID badge

HOWTO: Get a free Encom ID badge

CREATE A FLYNNLIVES.COM ACCOUNT BEFORE YOU START PLAYING IF YOU WANT THE BADGE! Go to this site. You have to name all the video games in the picture above. Answers after the jump... (more…)

HOWTO: Beat the London cops on a “terrorism” stop

The Love Police do an amazing job demonstrating how to get out of being searched under section 44 of the Terrorism Act. Stopped by police outside the Tower of London, they avoid being searched, having to give their personal details and having their camera film looked at simply by stating the law, remaining calm and polite. (Although keeping the [...]

HOWTO: Prevent crappy TV images in your photographs

HOWTO: Prevent crappy TV images in your photographs

Ever notice how older-model televisions and monitors have that scanning-in-progress look in video and photographs? That's because your lens is literally capturing the set in the middle of a screen refresh. You can avoid that effect with some camera adjustment. The Digital Photography School blog explains the capture science behind trying to [...]

HOWTO: Stir natural peanut butter easily

HOWTO: Stir natural peanut butter easily

You know how a jar of natural peanut butter separates into two layers: a rock hard layer of solid peanut particles on the bottom, and a liquid layer of oil that splashes onto the kitchen counter and your clothes when you try to stir the two layers together? John Falk Kelly didn't like it when that happened, so he came up with a way to mix peanut [...]

HOWTO: Linux Hotplug a CPU

HOWTO: Linux Hotplug a CPU

How do you hotplug a CPU on a running Linux system? Would you like to dynamically enable or disable a CPU on a running system? Linux kernel does supports cpu-hotplug mechanism. You can enable or disable CPU without a system reboot. CPU hotplug is not just useful to replace defective components it can also be applied in other contexts to [...]

HOWTO: Use con-games to improve information security

HOWTO: Use con-games to improve information security

"Understanding scam victims: seven principles for systems security" by Cambridge University's Frank Stajano and Paul Wilson is an excellent look at the principles involved in "short cons" (confidence games that only take a few minutes to "play") and how they can be applied to information security. The authors examine the mechanics of scams [...]

HOWTO: Defend yourself at gun point

HOWTO: Kill wiretaps when making a phone call

HOWTO: Kill wiretaps when making a phone call

CALEA is the terrible US federal law that requires that all switches that carry voice-traffic be built with an easy-to-access remote wiretapping capability so that cops (or bad guys who know cop secrets) can listen in on your voice conversations without cooperation from the phone company. A team of University of Pennsylvania researchers (already [...]

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