ok, I actually posted previously on the similar topic but I had got myself into more issue since then.
The RB951 essentially was a peplink configured as drop-in mode (meaning the IP:175.x.x.124 is the peplink IP, as replaced by RB951 for POC purposes)
Port1 and Port 4 of RB951 is configured in a bridge, so the packets of 175.x.x.120/29 flows between these 2: ports1 of RB951 <-> RB951 port4 <-> into the existing firewall. and it is tested ok.
Port2 is then configured with a PPPOE client which assigned IP:202.y.y.1/24 (currently connect to another RB running PPPOE server for testing)
It is tested that ping and trace route from the RB951, packet flows without any problem either thru Port1 or Port2 (PPPOE).
No issue with Test Terminal (175.x.x.123) <->RB Port 4 (Bridge) <-> Port 1 (Bridge: IP 175.x.x.124<-> Modem (175.x.x.121) <-> INTERNET and RB (202.y.y.1)<-> Modem (202.y.y.2) <-> INTERNET
But the issue now is:
The INCOMING connection is always at RB951 Port4, which is in a bridge for Port4 and Port2, from my test terminal, I can never reach 202.y.y.1 or 202.y.y.2 or, to enable any packet to NAT (or whatever way) from incoming port 4 to Port2 then go out through the PPPOE link, not a ping or anything, even with a correct routing mark, IP Route, or even make 175.x.x.121 the GW offline.
Tried numerous way I can think of but not working.
Anyone can help in this? How I make the packet goes (or NAT) from the bridge into another port which has a PPPOE running on it?