And So! Finally got to attach to the guest OS, an additional external IP address, I bought less, than 1 Euro at Hettsnera (Robot in the admin).
To set up, we need to make a new bridge (bridge) virbr2, but I'm not going to describe the steps here, how to do it (may be, later?), and only share with everyone magic link, where I found the answer to your question!
Russian manual for configuring kvm network bridge I, may be, lay out later, look at the source link below with instructions in English (the first part with the caps and you can skip).
Reference:
- English manual – http://www.snowguide.gr/gnu-linux-corner/96-ubuntu/187-hetzner-kvm-libvirt-walkthrough-to-routed-network-vms-for-ubuntu-guest-and-host