Recently, I got the great opportunity to write an article on network virtualization for the FreeBSD Journal. The article was published in its November/December 2019 issue, which can be accessed free of charge on the FreeBSD Journal website.
Reading the FreeBSD Journal is a great way to ingest information; its magazine style layout is more geared towards reading when away from the keyboard though. To ease copy and pasting from the article, I also published it here on my blog. It's also available in PDF format.