Increasing Internet bandwidth with 2 Provider

I have 2 wan pogrts from 2 ISPs. Does anybody know how can I increase(sum) my internet bandwidth?
:confused:

You are probably looking for bonding to increase the “sum” of your bandwidth. You will have to work with each provider to do that. You could do some simple load balancing to share the use of each connection.

http://wiki.mikrotik.com/wiki/Manual:PCC

Thanks but I have a problem.
I want to connet to internet by establish a ppoe client.
I have 2 dsl modems and I congigured them to Bridge mode so I have to have 2 ppoe clinet. In addition I have 1 public IP so another wan port has private IP. In this situation what can I do?