Author Archives: Jonathan Skerlick

Hi, my name is Jonathan Skerlick and I'm a network engineer who works on voice and data networks in multivendor environments. This usually makes life interesting as manufactures often implement the same technology but do it in their own way… meaning configuration requires specific knowledge of a given device. This underscores the importance of understanding the concepts FIRST before heading out on the road. While this may not always be practical this mindset can definitely make for a better experience!

Using Linux to verify DSCP

As previously demonstrated on Windows, here we’ll verify DSCP values using Linux. When implementing application(s) that require QoS such as voice and video, it is critical to verify the integrity of DSCP values. Keep in mind there are many applications, … Continue reading

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Bandwidth Testing with Iperf

When troubleshooting network related issues and suspect the network at fault it can be challenging at times to finding supporting evidence. One great tool for on-the-spot testing of network bandwidth is Iperf. It’s a simple, yet powerful tool that can … Continue reading

Posted in Bandwidth | 11 Comments

Using Windows to verify DSCP

In today’s converged networks Voice over IP (or VoIP) is a way to provide voice services over packet switched networks, replacing traditional circuit switched networks. While voice communications (as in audio) is a real-time application IP networks have inherent latency … Continue reading

Posted in VoIP | Tagged , | 7 Comments