VPN Interface and QOS

Hi there,

I would like to receive advise into the fact of using VPN (L2TP or OVPN) for QOS as an interface. I use of have an interface in queue trees in order to have QOS for L2TP and another for OVPN but the problem arises when two connections are on. When two connections are on, one of the client goes to the static server and the other one goes to a dynamic server. Is it possible to have every client in a single server (interface) or this is a NAT limitation?

What do you mean by static and dynamic server?

Static: The ones you create at PPP>Interfaces
Dynamic: The one it appears like when you connect with a valid profile but after another one is already on. This one in dynamic/generic.

I wanted to know if instead of using a random one, is possible to use the same Interface for every client.