Until recently, I’ve never had a chance to use VLANs on FreeBSD hosts, though I sometimes configure them on ethernet switches. But when I was playing with vnet jails, I suddenly got interested in VLAN configuration on FreeBSD and experimented with it for some time. I wrote this short article to summarize my current understanding of how to configure VLANs on FreeBSD. Terminology I think the word VLAN is being used in at least two different senses.