VBoxManage natnetwork

VBoxManage natnetwork  add
             --netname <name> {
             --network <network>
            [--enable|--disable]
            [--dhcp on|off]
            [--port-forward-4 <rule>]
            [--loopback-4 <rule>]
            [--ipv6 on|off]
            [--port-forward-6 <rule>]
            [--loopback-6 <rule>]

VBoxManage natnetwork  remove --netname <name>

VBoxManage natnetwork  modify
             --netname <name>
            [--network <network>]
            [--enable|--disable]
            [--dhcp on|off]
            [--port-forward-4 <rule>]
            [--loopback-4 <rule>]
            [--ipv6 on|off]
            [--port-forward-6 <rule>]
            [--loopback-6 <rule>]

VBoxManage natnetwork  start --netname <name>
VBoxManage natnetwork  stop  --netname <name>

VBoxManage natnetwork  list [<pattern>]