I am using MC8705 and running Linux OS. I have 2 SIM with AT&T wireless network - One SIM doesn’t need to set username and password, the other requires username/passowrd to log on.
SIM without username/paswword works well - but the SIM with username/password always fail to connect to AT&T PPP server. Contact with AT&T and they told me that Sierra modem does send PAP/CHAP authentication in the PDP context, but from PPPd log file, I saw PPPd has sent CHAP authentication and always got OK message from server. And immediately after authentication phase, modem hung up by the peer.
I wonder Sierra modem has PPP running inside the modem, and it handles PPP negotiation with host instead of forwarding to PPP server. That is the reason why PPPd from host got back OK CHAP message but in fact it is not.
My question is that there is any AT command to set PAP/CHAP authentication in MC8705 ?
Any help would be greatly appreciated.