{
  config,
  lib,
  pkgs,
  nodes,
  ...
}:
{
  imports = [
    ./hardware-configuration.nix
    ./disks.nix
  ];

  boot.loader.grub = {
    enable = true;
    efiSupport = true;
    efiInstallAsRemovable = true;
  };

  boot.kernel.sysctl."net.ipv4.ip_forward" = true;
  kat.wireguardPubKey = "BgLBrWG7DRj2Gwoyj+vHZTjiB3gPEnwVcDFEQH/BYgg=";

  networking = {
    useDHCP = false;
    firewall.allowedUDPPorts = [ 1194 ];
    nftables = {
      enable = true;
      tables.nat = {
        family = "ip";
        content = ''
          chain postrouting {
            type nat hook postrouting priority 100;
            ip saddr 10.42.0.0/16 masquerade
          }
        '';
      };
    };
  };
  systemd.network = {
    enable = true;
    networks = {
      "10-ens3" = {
        name = "ens3";
        address = [
          "51.83.69.54/32"
          "2001:41d0:305:2100::5c52/56"
        ];
        routes = [
          { Destination = "51.83.68.1/32"; }
          {
            Destination = "213.186.33.99/32";
            Gateway = "51.83.68.1";
          }
          { Gateway = "51.83.68.1"; }
          { Gateway = "2001:41d0:305:2100::1"; }
        ];
        dns = [ "213.186.33.99" ];
      };
      "50-wg0" = {
        name = "wg0";
        address = [ "10.42.0.2/16" ];
      };
    };
    netdevs = {
      "50-wg0" = {
        netdevConfig = {
          Name = "wg0";
          Kind = "wireguard";
        };
        wireguardConfig = {
          ListenPort = 1194;
          PrivateKeyFile = "/etc/wg/private.key";
        };

        wireguardPeers = [
          {
            AllowedIPs = [
              "10.42.0.1/32"
            ];
            PublicKey = nodes.kat-manah.config.kat.wireguardPubKey;
          }
          {
            AllowedIPs = [
              "10.42.1.1/32"
            ];
            PublicKey = nodes.kat-probook.config.kat.wireguardPubKey;
          }
          {
            AllowedIPs = [
              "10.42.2.1/32"
            ];
            PublicKey = nodes.kat-mail-test.config.kat.wireguardPubKey;
          }
        ];
      };
    };
  };

  security.acme = {
    acceptTerms = true;
    defaults.email = "root@katvayor.net";
  };
  kat-proxies = {
    enable = true;
    internal-webroot = pkgs.runCommand "watcher" { } ''
      mkdir -p $out/.kat-watcher/
      ln -nsf ${./error} $out/.kat-watcher/error
    '';
  };

  environment.systemPackages = with pkgs; [ tcpdump ];

  services.openssh.enable = true;

  system.stateVersion = "23.11";
}