1) There is a router ZyXEL Keenetic Giga, updated to the latest stable firmware.
2) Have the modem from MTS, ZTE MF 658. It is in the list supported by the router modem.
Now, click "connect". See: Initializing -> Connection -> Protocol Error. Then all over again.
The router defines the modem settings of the Internet everything is in place, there is a switch method of authentication (CHAP, PAP, PAP+CHAP) — tried all, not working.
A couple of times managed to connect and pings are passed, but as soon as I opened the web browser once everything is back passed out.
On the computer using the standard program the modem works.