I have a setup where my Mikrotik is connected to my network via Eth1. On the network I have a bridge which bridges an ADSL modem into my network (using Vlans via a different router). From Eth 1 I do a PPPoE connection which works as expected and I can receive my traffic. Forwarding the traffic back to a device on the network however doesn't work, I can ping the device I'm forwarding to from the Mikrotik, but the forwarding bit fails.
The only firewall rules I have is a NAT rule to masq all my traffic via the PPPoE connection, and to forward packets from the Mikrotik to my device. How can I forward traffic back into the network via Eth1?