Confused about QOS. Not sure how to limit bandwidth from WAN on single port

[GlowingApple]

I have an RT-AC68R running merlin. Inside my network I have a Plex server set up with a port forward. I want to limit bandwidth on port 32400 to that server, but only from the WAN (I still want full bandwidth for LAN clients). I've looked into the router's QOS settings, but can't figure out how to do this... Any help is appreciated!

 

[ColinTaylor]

As far as I understand it the QOS rules only apply to WAN traffic.

 

[GlowingApple]

Hmm, that makes perfect sense and seems fairly obvious now. Not sure why I didn't realize that before! Thanks!

Just set up a rule and tested it and it does apply only to the WAN.