Load balancing/traffic shaping with MAC address

[mathias]

Hi all.

I've searched the forum but I couldn't find anything about load balancing with MAC address.

To be more specific I have a couple of users connected to an optional interface, I would like them to share the bandwidth (on the WAN interface) equally, the only method as I see it is to share the bandwidth pr. mac address in some sort of way.

Is the above even possible, or should it be solved in another way?

Thanks!