Add routes after ppp interface up

1

I have xl2tpd daemon client which connects to remote server and I need to add routes after established connection. On traditional distros it’s enough to add commands to /etc/ppp/ip-up.local script, but on NixOS it doesn’t work.

I tried to add this:

networking.interfaces.ppp0.ipv4.routes = [{
  address = "172.66.0.0";
  prefixLength = 16;
  via = "172.66.16.1";
}];

but it does not fit to ppp interfaces because of oneshot type.
Is there a propper way to add routes on ppp interface up?

2

Ended up with this:

  networking.interfaces.ppp0.ipv4.routes = [{
    address = "172.66.0.0";
    prefixLength = 16;
    via = "172.66.16.1";
  }];
  systemd.services.network-addresses-ppp0 = {
    wantedBy = [ "sys-subsystem-net-devices-ppp0.device" ];
    serviceConfig.ExecStartPre = "${pkgs.coreutils}/bin/sleep 3";
  };