jail host

# /etc/rc.conf
# VLAN20 - virt int
cloned_interfaces="bridge0 vlan20 bridge1 vlan40"
ifconfig_vlan20="vlan 20 vlandev em0"
ifconfig_bridge0="addm vlan20 up"
# VLAN40 - virt pub
ifconfig_vlan40="vlan 40 vlandev em0"
ifconfig_bridge1="addm vlan40 up

# grep vnet /iocage/jails/pubjail/config.json
    "interfaces": "vnet0:bridge1",
    "ip6_addr": "vnet0|2001:xxxx::99:a999/64",
    "vnet": 1,
    "vnet0_mac": "02ff6005de3c 02ff6005de3d",
    "vnet1_mac": "none",
    "vnet2_mac": "none",
    "vnet3_mac": "none",
    "vnet_default_interface": "bridge1",
    "vnet_interfaces": "none",
    
# grep vnet /iocage/jails/intjail/config.json
    "interfaces": "vnet0:bridge0",
    "ip4_addr": "vnet0|10.0.20.123/24",
    "vnet": 1,
    "vnet0_mac": "02ff60d1b7e1 02ff60d1b7e2",
    "vnet1_mac": "none",
    "vnet2_mac": "none",
    "vnet3_mac": "none",
    "vnet_default_interface": "bridge0",
    "vnet_interfaces": "none",