Hello,
I use a RB2011 and I have 2 WAN ports. One via cable modem on ether6 - this port gets an IP from the DHCP server.
Then my modem is connected to ether7 port. There I have setup a PPPoE client - when the connection is established a pppoe-out1 network interface will be added.
But how can I setup that requests to port 80 will be routed via the pppoe-out1 interface and not via the cable modem on ether6?
For ether6 I created a masquerade rule and a default route.
But when I do the same for pppoe-out1 it does not work. 
Can anyone please help me?
Thanks.