I'm using 4Mbit/s with my account through PPPoE > Modem.

My ISP is filtring traffic by MAC, with my account I can connect to internet with two computers each one with 2 Mbit/s.

If i connect to internet with a computer I can use only 2 Mbit/s never 4 Mbit/s.

I have 14 PCs and I can share only 2 Mbit/s, How to share 4 Mbit/s?

Fake the MACs of a MT router (for example a RB450) and then bond the two interfaces..