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Choosing the Right Channel for Your Wireless Network

Choosing the wireless channel to use on your network can be a real pain in the ass; especially if you live or work (if this is a business network) in a densely populated area.

Put simply, channels are the radio ‘frequencies’ which your devices use, to talk to the router to get on to the internet or on the LAN.
If there are too many routers using the same channel in a close proximity, you are more likely to experience a slower connection, connection dropouts, general interference and other problems.

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Tech

How StolenCameraFinder and EXIF Work

I found a unique website the other day called StolenCameraFinder – I lost my Sony A200 DSLR a while ago so I decided to give StolenCameraFinder a go to see what it could do for me.

In a nutshell, you upload a photo taken by the stolen/lost camera to the website. It then cross references a unique serial number which is found in the picture against a large database of serial numbers. If the serial number is found in the database, it could potentially mean that a photo was taken from your camera and uploaded online after it was lost/stolen.

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Installing TCPDump on DD-WRT WRT54GL

This article will serve as a quick tutorial on installing TCPDump on a LinkSys WRT54GL box running the custom DD-WRT firmware.

TCPDump is a command line packet analyser. It’s a bit like Wireshark except it is command line based and in this tutorial, we will be installing it on a router and not on a PC.

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Quick and Easy Tutorial on Installing and Configuring fail2ban on an Amazon EC2 Instance

This article will serve as a quick tutorial on installing and configuring fail2ban on an Amazon EC2 instance.

I like to think of fail2ban as a ‘second line’ of defence against systematic attempts to break through and access SSH on a server.
First line of defence should always be disabling the root log-in, using strong passwords/using private keys for log-on, etc.
It can do a lot more than protecting against brute-force SSH attacks using regex’s but that is not in the scope of this tutorial.

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Tech

Generating Error Snapshots with LoadRunner Controller

LoadRunner Controller throws up errors here and there almost all the time; 99% of these errors are due to either scripting problems or code changes (the other 1% are out of memory exception errors ;))

The errors generated in the Controller are usually enough to figure out what the problem is, however there are times where the errors generated leave one searching for clues like a scavenger hunt.

Then I came across this option in the Controller… “Generate snapshot on error“… hmm, this looks like it could prove very useful for web testing.
Indeed it did. Turns out that every-time an error is encountered in the Controller, a snap-shot of the page the error was encountered on will be saved and stored in the results folder in .html format.