I’m running a MikroTik router in my office, connected to a 4mbit ADSL modem. I’m planning on adding another 4mbit ADSL line and want to create some kind of a virtual 8mbit connection from the MikroTik router to the 2 ADSL modems?
if you use PPPoE and your provider supports MLPPP, then you should be able to get 8 mbps link.
if no (and I think the answer is ‘no’ ), then you can only load-balance between two channels. the simpliest way to do that - direct one group of users via channel 1, and another group via channel 2