Additional network card

[netbone]

How to make an additional hardware network card avaiable on proxmox engine correctly (place in other subnet)?

How to create a VPN Side 2 Side (i.e. OpenVPN) on Proxmox. Without Proxmox all works well, but having hard trouble to create side 2 side VPN on Proxmox (working in root, not inside a VM)

 

[netbone]

Just - simply copy settings from /etc/network/interfaces from eth0 to eth1 and all works well. The site 2 site tunnel is working well, too, but not inside a VM, because I found no way to connect 2 bridges to the same interface. I always end with the information that a bridge is already connected to this dev

Any solution for my problem?

Server1 ----> tap0 (===OpenVPN===) ---> Server2 tap0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-----(===br===) eth0

Now I want to establish an additional connection from Server3

Server3 ----> tap0 (===OpenVPN===) ---> Server2 tap1


Problem:
How to connect tap1 via bridge to eth1 when already a bridge from tap0 is established?

Background:
Server 1 and Server 3 acts as routers. Both forward the net to Server 2. The net itself is connected to eth1 on Server 2. I need to get traffic to and from both servers (Server 1 and Server 3) into the net eth1.