Virtual network interfaces support is provided by templates number 1, 8, and 10. Note that none of them works with Microsoft Windows. Other host operating systems work with all three templates. Both usb_template(4) and if_cdce(4) kernel modules must be loaded.

Make sure the necessary modules are loaded and the correct template is set at boot by adding those lines to /boot/loader.conf, creating it if it does not already exist:

if_cdce_load="YES"
hw.usb.template=1

To load the module and set the template without rebooting use:

# kldload if_cdce
# sysctl hw.usb.template=1