Mangle Rules - Dual WAN NAT to backup WAN

Hello,

New to RouterOS. I have a dual WAN setup with a cable and DSL connection. We have a static IP on the DSL(2-Bell) and a dynamic ip on the cable (1-Rogers).

I used a script found online to setup the failover function and its working perfectly. 1-Rogers is a primary connection because the bandwidth is much higher.

We only really need to port forward a single port (1723) to an internal server but we only want it forwarded from the static IP on the DSL (2-Bell) connection. The NAT rule works perfectly if I disconnect the primary 1-Rogers connection but the second it comes back online the forwarding stops working.

I know enough to know that I need to use mangle to force the connection outbound on the same as it came inbound but I just dont know how to do that. Any help would be appreciated.

bump

did you ever fixed that problem because i have similar problem ?