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Tech

Using DD-WRT and DNS-O-Matic to Automatically Update DynDNS, OpenDNS and Other Services

DNS-O-Matic is a free service provided by OpenDNS. With DNS-O-Matic, you can propagate IP address changes across multiple services such as DynDNS, OpenDNS and many others.

With DD-WRT, you can set-up DNS-O-Matic so that your services stay updated with your IP changes as soon as they happen.

This article will very quickly go through the process of setting DNS-O-Matic on your DD-WRT powered router.

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Tech

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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Tech

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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Tech

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.