I switched my internet service provider a while ago. The router that I have received from my new provider came with no option to change the LAN subnet addressing or prefix. Being stuck with a /24 prefix for both personal devices and homelab needs was a hard pill to swallow. Although I have never actually gotten to a point where I utilized an entire /24 subnet before. The reason was that labs were already set up with a larger and different subnet on my older connection. Plus, having a large prefix gives more flexibility in how things can be segmented. Unfortunately, changing the firmware to something like DD-WRT was not an option, either. Therefore, I had to rely on a virtual router in order to expand my local network.

I chose VyOS, an open source router, to do this. It is really lightweight and simple to configure, and it fits my use case exactly how I wanted it to. I deployed it on my oVirt cluster, with the following setup in mind:

As displayed above, I would like that my VMs in prefix (172.20.20.0/20) are able to reach internet or any other service available in the main LAN (10.0.1.0/24). Therefore, I’m going to let VyOS act as the NAT Gateway for those VMs. Read More »