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It took a while to set up.
First, I had an issue in China because of UDP QoS. The game I was playing worked, but eventually you get the connection dropped.
So I connected through Wireguard and used udp2raw to simulate a TCP connection. It worked, but eventually the IP would get banned because China bans VPNs.
So I used xtls xray to get around this, but in normal operation it wraps UDP into TCP. This means when a packet drops it gets retransmitted which causes lag in the game at the smallest amount of congestion (and China is super congested connecting outside the country)
So instead of using http 2 I upgraded to QUIC by routing through nginx. Then I could still use udp2raw since QUIC is UDP. To smooth out the packet loss I used udpspeeder. To route all packets in the client I used tproxy with iptables rules.
Now, the best part is I'm on NixOS and I used the NixOS packages and wrote it as systemd services.
If I copy my folder to another computer and update all of this software would start up and route to the correct ports/addresses automatically.