Add system modules

modules/system/network.nix

@@ -0,0 +1,13 @@
+{ config, pkgs, ... }: {
+  networking.hostName = "benq-serv";
+  networking.networkmanager.enable = true;
+
+  networking.firewall.allowedTCPPorts = [ 22 80 443 ];
+  networking.firewall.allowedUDPPorts = [];
+
+  boot.kernelModules = [ "tcp_bbr" ];
+  boot.kernel.sysctl = {
+    "net.ipv4.tcp_congestion_control" = "bbr";
+    "net.core.default_qdisc" = "fq";
+  };
+}