[SOLVED] Create Private Network Bridge with NAT

There are several DNS servers. At first I used the one from my ISP then I switched to Unbound, which is caching, yes. For authoritative DNS I use Bind9.
 
Thanks everyone, I have a fully functional virtual machine now.
Now I need to figure out how DHCP with local IPs work, that's for another day though.
 
You can install the dhcp server on any machine connected to vmbr1, that means a VM or Proxmox itself.
 
There are several DNS servers. At first I used the one from my ISP then I switched to Unbound, which is caching, yes. For authoritative DNS I use Bind9.
I use Windows 2008R2 AD DNS for internal use and two bind9 on my public IPs for domain zone.