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Knock: TCP Port Knocking Proposed For Linux Kernel

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Linux

Port Knocking is the process of opening network ports on a firewall by first attempting to connect to a set of predefined unopen ports. It's effectively a key for opening network ports with the password being the pegging of other closed network ports in the correct sequence.

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Pro tip: Find tons of open-source Android software with F-Droid

If you're looking for truly open-source software for the Android platform, you don't have to do a ton of searching or check through licenses from within the Google Play Store. All you have to do is download a simple tool called F-Droid. With this tool, you can download and install apps (from quite a large listing) as easily as you can from the Google Play Store. You won't, however, find F-Droid in the Google Play Store. Instead, you have to download the .apk file and install it manually. Once it's installed, the rest is just a matter of searching for an app and tapping to install. Read more