When an IT support ticket is passed to the network engineering group, one of the first steps in the troubleshooting process is to verify whether it is the network that is causing the problem or not. Especially when it’s not obvious to the naked eye that it’s the network’s fault….
Agent-based network and application monitoring has been gaining more and more attention due to the increased complexity of enterprise networks and the services they support. Nowadays, a typical medium to large company has users in multiple geographical locations that use web applications that might be served by an on-premise data…
Importance of QoS TL;DR: In this article I want to provide a simple way to troubleshoot and validate QoS. All networks are not created the same. Every business has a different set of needs and requirements. How do you ensure your critical services and applications are receiving the highest priority…
In this article I would like to present a simple setup that allows you to interconnect a local area network to a Virtual Private Cloud (VPC) hosted on Amazon Web Services (AWS) with a private VPN tunnel. The tunneling technology used is OpenVPN. To implement this configuration you will need:…
Every network interface is set with an MTU (Maximum Transmission Unit) value that defines the byte size of the largest protocol data unit that is allowed to pass. So what happens when a frame or packet is larger in size than the MTU value of the interface? It depends on whether…
Troubleshooting Remote Application Issues How many times are users aware of remote application issues before you are? How much time do you spend collecting information about the problem from the end users or your monitoring systems before you can pinpoint the root cause? The number of hardware and software components…
This is the last of three posts about planning, executing, and validating network configuration changes. You can find the first two here and here. Validating Network Configuration Changes This is a critical part of any configuration change. The goal of this phase is to make sure that the work was…
Network tomography is the inference of the internal behavior and topology of a network, based on end-to-end network measurements. Imagine having the ability to probe the network from its edges and reach conclusions about its guts. Similarly, computer tomography allows you to create an image of an object or a human…
This is the second of three posts about planning, executing, and validating network configuration changes. The first post discusses the planning phase of network configuration changes. The last part is coming up in two weeks. Executing Network Configuration Changes This is the day of the launch when the rubber hits…
This is the first out of three posts about planning, executing, and validating network configuration changes. The other two posts will be published at distance of two weeks on the NetBeez blog. Validating Configuration Changes It’s not surprising that a great portion of the activities of a network engineer relate…