The cloonix development team recently updated the cloonix network simulator to version 24. This post describes the changes in cloonix v24 compared to cloonix v19, which we reviewed in a previous post. Version 24 simplifies the setup of guest virtual machines, improves the link performance emulation tool, and adds new interface types designed to improve […]
The Cloonix open-source network simulator was recently updated to version 24. The last time I used Cloonix, it was at version 19 (see my review of Cloonix and my using the Cloonix graph interface posts). Compared to version 19, only a few details of the installation procedure have changed — the list of package dependencies
While working through some of the previous tutorials about the CORE Network Emulator or IPv6, we noticed some strange broadcast packets in the Wireshark packet analyzer that appeared to have nothing to do with the processes running on the simulated network. For example, we started a simulation consisting of two nodes connected to the same
In Part 1 of this series, we performed some practical experiments to show how interfaces in an IPv6 network configure themselves with link-local IPv6 addresses when they start up. We also showed how to manually configure IPv6 addresses on a Linux system. In this post, we will use an open-source network simulator to demonstrate another
IPv6 addressing is about more than just a longer 128-bit address length. The working groups that defined IPv6 were trying to solve some of the problems that programmers, network administrators, and network engineers were encountering with IPv4. The way that IPv6 prefixes and addresses are assigned and configured differs significantly from IPv4. IPv6 offers some
Previously, we installed the CORE Network Emulator from source code and installed the network services used by CORE. Now, we want to run a simulated networking scenario and modify the configuration of the quagga routing daemon on one or more virtual routers. To do this, we open a shell to the node and start the
To emulate the operation of IP networks, the CORE Network Emulator requires that routing and networking software be installed on the host Linux system. CORE creates virtual nodes using the Linux Containers (LXC) network namespaces feature so all services installed in the host computer will be available to run on the virtual nodes created by
When I started a CORE Network Emulator simulation scenario on my computer running the Xubuntu Linux 13.10 operating system, I encountered a few issues that I needed to correct. The Ubuntu Network Manager drops my WiFi connection after I start the CORE simulation scenario and the Terminal does not start when I double-click on a
When I started researching open-source routing and networking software, I ran the open-source Linux operating system on a virtual machine running on my Apple iMac computer. When I wanted to experiment with virtualization technologies such as KVM, which will not work inside a virtual machine, I set up my iMac to dual-boot Linux and Mac