Question 2 pcs on the same network can't play together

[krome4284]

Basically the title of the thread. He is on the 5ghz wifi and I am on an ethernet connection. I've tried using port forwarding, port triggering, and DMZ. DMZ has been mostly effective, but not always and I don't feel comfortable using it at all for security reasons. The only thing that works is using a VPN but that creates a noticeable amount of lag on multiplayer matches for me. This issue didn't start until he swapped from using a wall adapter to just using wifi since the speed he gets on wifi is faster. My upnp has always been on and I tried with it off. Idk what else to do. Having to mess with the VPN is annoying af. My wife is getting her replacement part soon and we all have regular gaming sessions, and I want this fixed before her part comes in. They were both on wall adapters and we never had issues. My brother swapping to wifi is worrisome.

I have a surfboard sb6190 and a tp-link ac1750 on a 1gb/s internet speed

My build:
Cpu - Intel i7-4770K 3.5 GHz
Motherboard - MSI Z87-G45 Gaming
Memory - Corsair Vengeance 16 GB (2 x 8 GB) DDR3-1600 Memory
Storage - WD - Caviar Blue 1 TB 3.5"
Video Card - EVGA - GeForce GTX 1080 8 GB
Power Supply - Corsair - Builder 600 W 80+ Bronze Certified ATX Power Supply $89.89
Optical Drive - LG - GH24NSB0 DVD/CD Writer

Brother's build:
Cpu - fx8350
Motherboard - Asus - M5A97 R2.0 ATX AM3+
Gpu - R9 380x
RAM - Kingston - HyperX Fury Black 16 GB (2 x 8 GB) DDR3-1866 Memory
Storage - WD 3.5 7200rpm
PSU - Corsair CX 600

 

[Eximo]

It is quite typical to have difficulty bridging encrypted networks with unencrypted networks with consumer grade hardware.

I suggest running an ethernet cable if at all possible. Or get a better ethernet over power adapter.