Thank you for your message.
No, I'm not sure about id & password, it is what I find on the web: in most case username is "admin" and password "123456". I use the IP given "by arp -an".
last result was the following:
frankk@myDebian:~$ arp -an ->
? (192.168.43.1) at e8:b4:c8:07:d0:69 [ether]...