alright, current config:
WAN1 (drop in) + WAN2 (PPOE) <-> Peplink <-> Firewall
The peplink is configured as a drop-in meaning that the WAN1 IP (175.xxx.x.124/29) is actually sitting on the peplink and the firewall is connect to the peplink with IP:175.xxx.xxx.123. There are several public IP assigned to this WAN as well, 175.xxx.x.122,125,126.
The WAN2 is a normal PPOE (202.xx.xxx.1) connection but there are several public IP assigned to it (202.xx.xxx.3,4,5) and it is specified in the peplink.
There is no inbound filter rules but there are some NAT rules generally translate the IP from Public IP of WAN1 & WAN2 to 175.xxx.xx.123 for access, e.g. WAN1: 175.xxx.xx.122 translate to 175.xxx.xx.123, WAN2: 202.xx.xxx.4 translate to 175.xxx.xx.125 translate to 175.xxx.xx.123
My intention is not to touch anything at all for the WAN and firewall but just to port the config from the Peplink to a RB to show my customer that this is possible.
There is not much issue for WAN1 as I had tried to use bridge, or Master-Slave port setting, bridging the WAN1 port with the LAN port, and with NAT to DST-NAT 175.xxx.xx.122,125,126 to 175.xxx.xx.123, works just fine, on initial testing.
The problem now:
WAN2, after much trying, I had resorted to DST-NAT 202.xx.xxx.3,4,5 to 175.xxx.xx.125 (by placing the 175.xxx.xx.125 at the other end of connecting interface), it is tested to do what had been configured but is it possible that RB can do something similar like Peplink, e.g. WAN2: 202.xx.xxx.4 translate to 175.xxx.xx.125 translate to 175.xxx.xx.123, as I am suspecting that's what peplink has been doing all along, also with the intention not to touch the firewall, I would wish to achieve WAN2: 202.xx.xxx.4 translate to 175.xxx.xx.125 translate to 175.xxx.xx.123.
Any help on this?
Also on side note, what would be the best practice with comes to implementing Multi-WAN Load balancing?
Can anyone here give/show me some hint/example?