Trouble is that Orange Polska . . . will not issue us our broadband username/password . . .
Ah, that is unfortunate.
However if you were to monitor the Ethernet link between the HG8010H and the VMG8924-AC, with
Wireshark, you could capture the CHAP challenge & response. That would directly show the "username" part of the credentials. Then with the use of
Hashcat it would be possible to recover the plaintext "secret" part of the credentials.
Please take a look at this
five page thread, dating from last summer, when
psychopomp1 was in a similar situation with regards to his authentication credentials.