I know it is possible to make two different subnets part of a specific VLAN tag, but I am not sure how to configure this in OPNSense?
For instance suppose I would like 10.1.20.0/24 and 10.1.22.0/24 to be part of VLAN tag 20?
IMHO, you create your vlan and tag it, as mentionned and then try adding it by virtual ip. i am not experienced in that, but i might give you at least a hint.
Thanks, I will give that a try and see if it works. I am currently absolutely stumped on where I was supposed to go to accomplish something like that.
Try Interfaces -> Virtual IPS -> Settings