Developers Club geek daily blog

We test quality of VoIP via channels of mobile operators (iOS)

1 year, 10 months ago
In the previous article we considered utilities under Android for testing of speed of the channel from the device to IP-ATC. Now queue of iOS.


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Two-factor authentication of clients of Cisco AnyConnect. FreeRadius and Google Authenticator

1 year, 10 months ago


In the previous article I considered setup of two-factor authentication of users for connection to corporate resources through Cisco AnyConnect based on the Active Directory and Microsoft Azure Multi-Factor Authentication Server (MFAS). Today I suggest you to consider option with use of FreeRadius and Google Authenticator.

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We take away an audio stream with Twilio on SIP and we send to RTMP CDN for further distribution

1 year, 10 months ago
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It is known that in the nature there are CDN networks which are used for delivery of stream video to ultimate users. To take for example online broadcast of a football match. Historically it developed that the RTMP protocol developed by Adobe in certain time became very popular for Live-videokontent's delivery, and support of this protocol is in each Encoder-device respecting itself or the program which takes a video flow from the camera and sends to the server or CDN for the subsequent distribution. In article it is described how to make SIP a flow source for CDN.

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HP, Dell and IBM: the components which are responsible for reliability of the server

1 year, 10 months ago
The main criterion at the choice of server hardware — reliability. Today we will make the small overview of components to which it is worth paying attention from this point of view as they allow the server to work not only uninterruptedly, but also continuously.


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New data-center of Intel: high performance and extreme density of placement of the equipment

1 year, 10 months ago

New 60U are resistant in a new data-center of Intel

The Intel company sets up records of overall performance of the data-center, having created racks of new type on own project. New server racks, having height in 2,7 meters, are a key element in data-centers of the company, allowing to increase density of placement of the equipment and to increase efficiency of use of resources, including the electric power.

Internal requirements of the company are serviced by about 59 data-centers worldwide. The total quantity of servers in these data-centers makes 130 thousand. Now the company transformed the former enterprise for production of semiconductors to a highly effective data-center. There is it in Santa Clara, California.

The former factory became field laboratory of the company where the innovations concerning data-centers are tested. This data-center can soon become one of the most powerful in the Silicon Valley as Intel is going to bring object power to 30 MW within 5 years.

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Two-factor authentication of clients of AnyConnect. Active Directory and Azure Multi-Factor Authentication Server

1 year, 10 months ago


Already practically at anybody that why two factor authentication are necessary, especially at access to resources of remote users does not raise questions. A priori the user treats rather irresponsibly storage of the passwords protecting working information as it is not surprising, considering how many personal passwords it is necessary to remember also priorities of the ordinary person in respect of protection of personal or working information.

Implementation of authentication of remote users by the principle "+ something I have" allows to make by something I know the attack directed to interception or selection of passwords senseless and to considerably reduce threats of IB from receipt of a user password by the malefactor.

I submit you the guide to the Microsoft Azure Multi-Factor Authentication Server (MFAS) setup as the second authentication factor at connection of domain users to resources of the company by means of Cisco AnyConnect.

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Samba and illegal characters

1 year, 10 months ago
Samba (samba) under Linux. This surprising software presented to linuksoida a possibility of communication with the world of Windows.
I remember that marvelous feeling when in the local area network the first appeared my a samba server. Eh, there was time!

But a post not about it. Not on a naslyshka I know that many are irritated by limited support of special characters in Windows. But it is not an occasion to refuse them, isn't it?

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Details of my misadventures and (almost) happy final under a cat. Let's start!

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Christmas gifts from 3CX

1 year, 10 months ago
Before approach of Christmas and New year the company 3CX offers excellent gifts to the partners. In a cash equivalent the sum of gifts to active partners makes more than 1000 Euros!
First, any partner who would will sell jotas one termless license for 3CX Phone System within November-December of this year receives free of charge:

  • The license for placement on a hosting of 4SC Standard Edition for 12 months for further resale. Equivalent of 175 Euros
  • Termless license Voice Application Designer. Equivalent of 875 Euros.

Let's remind that Voice Application Designer is a Wednesday of visual programming of automatic telephone exchange of 3CX which allows the partner to create with the minimum experience in VoIP powerful voice applications, for example, for a portal of voice self-service of clients. Then the partner can unroll these applications far off on a customer site or on the server of virtual automatic telephone exchange.

Pay attention! To receive these gifts, you have to complete sale till 11:00 24.12.15 on the Central European time (on the eve of Catholic Christmas). All sold licenses have to be enlisted on your partner account till this time.

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The IPv6 setup in Linux Debian v7.XX, Ubuntu v14.XX, CentOS v6.XX and FreeBSD v10.XX OS

1 year, 10 months ago
The material stated below does not apply for an exclusivity. However I had to bring together him on particles from different sources, checking something experimentally. After that the idea to systematize the gained knowledge and experience was born, having stated everything in one note.

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One more virtual interface

1 year, 10 months ago
In the previous note Linux kernel module code sketch for creation of the additional virtual network interface was shown. It was the simplified fragment from the real project which fulfilled several years without failures and claims so it can quite serve as a template for further improvement, correction and development.

But such approach to implementation, first, not only, and, secondly, in some situations it can be and unacceptable (for example, in the built-in system with a kernel is younger 2.6.36 where there is no netdev_rx_handler_register challenge yet ()). Below the alternative option with the same functionality but implementing it on absolutely other layer of a network stack of TCP/IP will be considered.

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