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Syncthing 0.14.46rc2 is now available in OKay's RPM repository since today. Syncthing is a complete synchronization, multi-platform solution to have same files on your devices. It is like a Peer-to-Peer.

Syncthing is an excellent option if you have at least one road warrior involved. Since there is no warranty of a public IP or even a static IP, Syncthing architecture allows clients to bypass NAT's and allow file exchange. The good thing about Syncthing is it is available not only on Linux and Windows but Android as well. You can have in sync important files on your mobile or tablet.

Please note that 0.14.x is not compatible with 0.13.x. So, you need to update everything.

RPM's are available for Centos 6 and 7. And you can find it if you type yum search syncthing.



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As explained in my last post showing the FusionPBX architecture, I am currently doing a training with some friends and before going to the wild command line, I am trying to explain information flows. In this article, I am trying to document a simple call flow. Please note that this diagram could vary if you compare with reality as dial-plans always vary from user to user. I have also taken out some SIP answers (in case a SIP purist read it)


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DNS tunnelling is just another tunnelling technique. Usually, it is called VPN over DNS too, it is just naming. What it makes it very popular is that not all carriers or network administrators are aware of it or if they are, they don't know exactly how to stop it. Rogers, one of the biggest telecommunication carrier in Canada and Telcel the biggest player of mobile telephony in Mexico, both allow DNS tunnelling (I don't doubt others carriers do as well), so when you run out of data in your plan you can still connect if you configure it in your mobile. This is because smartphones need to connect to some carrier servers regardless if you have right to 2G/3G/4G data access or not; smartphones still have access to the local DNS server. Local networks have the same symptom because DNS is used to access many IT services like the Active Directory, it is very difficult to differentiate between a true legitimate DNS query and DNS tunnelling traffic without proper tools.

Because of this, I am going to describe how this technique works.