I am setting up a RB493. We have two DSL lines we want to use to help with bandwidth issues. We want to us PCC to load balance over the connections.

One PPoE client is on ether2 and the other is on ether9. What happens is, when we enable the second PPoE client, it will disconnect the first and so on. We are unsure what is causing this, and I haven't had any luck finding issues that would prevent us from doing this. Could it be the DSL company not allowing multiple connections from the same MAC?

The mac addresses will be different for each ether interface so that not likely the problem.
The problem is most likely the profile for each pppoe-client is default.
or possibly the default route having to paths to the same gateway.