Extending Applications in Tcl

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(For more resources on Tcl, see here.) Very often applications need to be extended with additional functionalities. In many cases it is also necessary to...

Networking in Tcl: Using UDP Sockets

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(For more resources on Tcl, see here.) TCP support is built in to the core of the Tcl interpreter. To be able to use the...

Bar Reports in Zabbix 1.8

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Bar reports is the most sophisticated built-in data visualization tool in the Zabbix frontend. As such, they are also quite intimidating, thus we will...

Monitoring Windows with Zabbix 1.8

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While the things we learned about using Zabbix agents, creating items and yes, even user parameters are useful, there are some things that are...

Using Proxies to Monitor Remote Locations with Zabbix 1.8

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When proxies are useful A server is not always able to connect directly to the monitored machines. We could use active items everywhere (where Zabbix...

Triggers in Zabbix 1.8

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Triggers are things that "fire". They are the ones that look at item data and raise a flag when the data does not fit...

Graphical User Interfaces for OpenSIPS 1.6

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OpenSIPS Control Panel This tool, also known as opensips-cp, is the new graphical user interface for the SIP proxy. It was designed to be the...

Installation of OpenSIPS 1.6

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So, we won't use any shortcuts in the installation. I strongly advise you to install OpenSIPS using Debian. If you choose to install on another...

Installing OpenVPN on Windows and Mac

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Obtaining the software There are only a few prerequisites that have to be met if you want to install OpenVPN on Windows, if you are...

Advantages and History of OpenVPN

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Advantages of OpenVPN With the advent of OpenVPN a new generation of VPN entered the scene. While other VPN solutions often use proprietary or non-standard...