I am trying to solve this issue but cannot get it right. Now I am all messed up and cannot thing of a solution.
I have one MT with three WAN interfaces and one LAN interface. I have server connected to LAN and I want to set dst-nat port TCP 9500 on all wan interfaces to local server.
What think I got is that dst-nat works, server gets incoming requests and sends responses but router does not always pass response to the same interface which request came from.
It hapens that approximately one third of connection attemts succeed, which hints me that router does some kind of round robin among three wan interfaces to balance, and as there are three interfaces every third connection is passed to the interface request came from.
How can I control this? I want router to always pass response to the same wan interface request came from?