using ddclient with vigor routers (2200 and newer)

I followed this guide from that step is enough 5 DDNS Client Software - Linux DDclient (step 5 in content) I edited ddclient.conf this way

use=vigor-2200usb, fw=
fw-login=user,  fw-password=yourrouter_pass

login=                       # default login
protocol=freedns                                        # default proxy                       #                 # default server (bypassing proxies)            # domains must go after those login, use staff                          

you’ve to put it in that order otherwise you’ll get message like invalid login …