nixos-config/nixos/profiles/system/boot/sysctl/udp-buffer-size.nix

{ ... }:
{
  # https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes
  boot.kernel.sysctl = {
    "net.core.rmem_max" = 7500000;
    "net.core.wmem_max" = 7500000;
  };
}