_: {
  boot = {
    kernel = {
      sysctl = {
        "net.ipv4.ip_forward" = 1;
        "net.ipv6.conf.all.forwarding" = 1;
        "net.ipv4.ip_nonlocal_bind" = 1;
        "net.ipv6.ip_nonlocal_bind" = 1;
      };
    };
  };
}
