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
Recently, Google temporarily dropped my blog from its search results. Since over 75% of my traffic comes from first-time users who find the site through search results, this effectively caused a two-day “outage” for my site. As I tried to understand why my blog was not findable in Google, I realized that it would have
TinyCore Linux is very suitable for devices like routers that require a higher level of security. All changes made to a running TinyCore Linux system exist only in system RAM and are lost when the system restarts or is shut down. Viruses or file corruption can be removed simply by rebooting the system. When used