Networking Question

Hello,
I am trying to setup a HotSpot, and allowing 2 Addresses per MAC.
The customers wireless modem is on Bridge mode.
Now the router is not getting the MAC address of the modem, it’s getting the MAC of each computer, so, i cant use the function (2 addresses per MAC) because each one is loged in his own MAC.
is there anyway that my router sees the modems MAC address so both users behind it can use the same username/password?

thanks for any help.

Probably you bridge mode support clonning, then you can enable it,
where is the problem to use the particular configuration ?

i am not sure if it does support cloning or not.
the problem is, i have several access points for clients, and the umber of shared users is 1, but if a user has an access point of his own with also eathernet ports, i can allow up to 2 (or 4 or what ever under MAC addresses) to share the same username.
this cant be done if the MAC of the same computer is sent to me, it can only be done if the MAC of the modemor switch is sent, then i will have multiple IPs sharing the same MAC…
is it possible to point me of a protocol or whatever its name is, that the modem uses to send its mac instead of the computer it self so i can research it?

thanks.