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I just recently changed to a new modem (Arris S33) and a protectli vault with OPNsense. Also using a switch and wireless access point.

I did this to fix fluctuating and constant speed drops that my old modem/router was giving me. (Netgear C7000v2 slope). This has completely fixed my internet speeds by not only making them more stable but also faster.

However despite my improved speeds, my connection in online gaming is worse than before. This is the 2nd OPNsense router I have tried (thought the first one had faulty hardware or something) but the same thing is happening on my new one.

The game I'm playing uses p2p (peer to peer) connections between players. Not a dedicated server, so connections are based on the "host" player with the other players feeding off the host's connection.

I'm not sure how to go about fixing it, but from my research I think it might have something to do with UPnP or NAT.

My old router had UPnP enabled and did not have this issue.

I'm not sure how to go about fixing this or what settings to change. If someone could please help me I'd appreciate it! All my OPNsense settings are currently default except I changed my LAN ip from 192.168.1.1 to a static ip.

By the way I game on PC and it is hard wired to my switch (not WiFi). Thank you!

It sounds like you've made some great upgrades with your new modem and OPNsense setup! Given the issues you're experiencing with online gaming, it does seem likely that UPnP or NAT settings could be the culprit. Since your old router had UPnP enabled without issues, try enabling UPnP on your OPNsense device.