l2tp_set_tunnel
static int l2tp_set_tunnel(struct ifnet *, struct sockaddr *,
error = l2tp_set_tunnel(&sc->l2tp_ec.ec_if, src, dst);
error = l2tp_set_tunnel(&sc->l2tp_ec.ec_if, src, dst);
error = l2tp_set_tunnel(&sc->l2tp_ec.ec_if, src, dst);