Did you ever find a solution to this, I am having the same issue. If so can you give a little detail of what you did to solve the issues? Thanks in advance.
I have a RT-AC5300 & a GT-AC2900, both with latest merlin build. The RT-AC5300 connects to the GT-AC2900 (Open VPN), Redirect Internet Traffic Through VPN is set to NO but the issue I am having is that the wireless on the GT-AC2900 is assigning IP addresses through the VPN and using the Internet...