ASUS rt-ac87u (Merlin 380.69) DDNS service

[AlexGTH]

Hello!
I'll get to the point...ddns service from asus (and no-ip) work fine untill the ppoe connection restarts and ip change. The problem is here: the ddns service tryes to register before the wan connects and fails to update the ddns untill i manualy connect it.
I looked around with google but found nothing.

Jan 7 18:35:46 ddns_update: ez-ipupdate: starting...
Jan 7 18:35:46 ddns_update: connected to nwsrv-ns1.asus.com (103.10.4.108) on port 80.
Jan 7 18:35:46 ddns_update: Asus update entry:: return: HTTP/1.1 404 Not Found^M Vary: Accept-Encoding^M Cache-Control: no-cache, must-revalidate^M Content-Type: text/html^M Date: Sun, 07 Jan 2018 16:35:47 GMT^M Keep-Alive: timeout=5, max=90^M Pragma: no-cache^M Connection: close^M Content-Length: 351^M ^M <script type="text/javascript"> <!-- window.location.href="http://info.rcs-rds.ro/redirect.php?first_url=" + encodeURIComponent(encodeURIComponent("nwsrv-ns1.asus.com\/ddns\/update.jsp?hostname=
Jan 7 18:35:46 ddns_update: retval= 2, ddns_return_code (,404)
Jan 7 18:35:46 ddns_update: asusddns_update: 2