machine_setup/ansible/roles/jail/files/jails/cloak.conf

cloak {
    path = "/jail/${name}";
    vnet;
    exec.prestart += "/usr/local/bin/jail_netgraph_bridge start restricted_nat jail${name} 10.215.2.1/24";
    # Create a dummy interface that is never used, just to create the cloak bridge that is used by children.
    exec.prestart += "/usr/local/bin/jail_netgraph_bridge start cloak dummy${name} 192.168.1.0/24";
    exec.poststop += "/usr/local/bin/jail_netgraph_bridge stop cloak dummy{name}";
    exec.poststop += "/usr/local/bin/jail_netgraph_bridge stop restricted_nat jail${name}";
    vnet.interface += "jail${name}";
    vnet.interface += "cloak";

    devfs_ruleset = 13;
    mount.devfs; # To expose tun device
    mount.fstab = "/etc/fstab.${name}";

    exec.start += "/bin/sh /etc/rc";
    exec.stop = "/bin/sh /etc/rc.shutdown jail";
    exec.consolelog = "/var/log/jail_${name}_console.log";
}