Multiple MAC addresses on a single interface

[Alex Dupre]

Hi,
I need to establish two PPPoE sessions on the same LAN using the same 
ethernet interface. The sessions are on different VLANs, but they are 
handled by the same AC that doesn't allow that both sessions are 
initiated by the same MAC address. Is there a way to associate two MAC 
addresses to a single physical interface (even by creating a virtual 
interface linked to the physical one) and so have VLANs on different mac 
addresses, without forcing the use of a secondary physical interface?

-- 
Alex Dupre