You can't do it with PPPoE and PPTP. The WAN interface can only be configured for one of these at any time. It might be worth sticking a feature request for PPPoE and PPPTP combined WAN connection. It might be possible with PPPoE and IPSec, you would have to set the tunnel up with a far end network of 0.0.0.0 and I'm not sure how it would handle the routing table with this, as the IPSec routes don't appear in the routing table. Worth a try. Other than this, you would need some intermediate box that does the PPPoE connection and then run PPTP from the mono box.
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