how to create dummy interface?

[Gibzon]

i currently have a dummy0 working with vmbr1 on my server, it came with the installation and i use it for routing public ip...

but now i need to create a dummy1 to use with a new bridge for vlan tagging.

how can i create a second dummy? i tried this but nothing:

root@server:~# modprobe -o dummy1 dummy
modprobe: invalid option -- 'o'

root@server:~# ifconfig dummy1 192.168.1.1/30
SIOCSIFADDR: No such device
dummy1: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device

Regards.