In an Infrastructure As Code (IaC) scenario, rather than provision a VM and install a networking dedicated appliance, it is best to provide something without a web-UI but that provides a good configuration API or that sources its settings from something that can be easily managed by automated configuration tools.

In such as scenario it is more convenient to just use one (or more) Linux VM with a very basic installation, having it manage infrastructural networking: these VM can not only manage networking using routing protocol such as RIP, OCSP and even BGP, but also enforce security policies dropping unauthorised traffic.

In this post we see Free Range Routing (FRR) and OpenVSwitch on Oracle Linux in action, setting up a Lab with two virtual machines providing routing sharing routing tables using OCSP: we achieve this by installing Free Range Routing (FRR) - a free and open source Internet routing protocol suite for Linux. The advanced setup shown in this lab also makes use of OpenVSwitch, stacking FRR on top of it.

This dual layer setup enables us to exploit the Software Defined Networking (SDN) features provided by OpenVSwitch, enhancing by adding dynamic routing support, but also providing a compatibility layer with legacy bare metal devices such as "traditional" hardware routers.

Read more >