I installed mudfish on my OPENWRT router, so far so good. But I’m wondering, is it possible to assign the mudfish service to use different INTERFACE other than “LAN”? For example, I want to create another interface called “MUDFISH”, so that I can switch different wifi SSID between the normal internet or mudfish VPN for me to gameplay.
Current implementation of mudfish isn’t depending on the interfaces of OpenWRT. Instead of it, it depends on the routing table to pick which traffics should be redirected.
Currently I’m implementing a feature; Per-Eaddrs mode (Per Ethernet Address Mode). With this feature, you can set ethernet addresses you want to apply mudfish selectively. So I think it works for what you need in my opinion. 
Thank you for the reply. Looking forward to that feature. 