New and Manageable Router
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The former DSL infrastructure provider sucks.
They had called me to schedule the arrival of a techbician after another
another technician had treated my problem of frequent disconnections. I
refused and contacted another infrastructure provider. Now, I have another
router, A TpLink router to which I can connect simply by opening the web
browser and entering 192.168.1.1 in the address bar.
To configure the former switch/router I had had to install a mobile app.
Never again.
Having entered your admin password (change it!), you have more options.
You may want to connect to your ISP using your username and password. Do it
by clicking "internet" from the side menubar.
Then setup Wi Fi connection by clicking "Wireless" from the side menubar. You
can choose SSIDs for both 2.4GHz and 5GHz networks. You can also choose to hide
the SSIDs, and doing so is recommended.
If you find that you have no internet connection, you can restart the
router by clicking the little sun on the top of the screen. You will also
find a red little circle next to the globe in the "Network Map" side menu
(and "Basic" in the top) if there's no internet connection.

You can also set up some security definitions, such as IP filtering, MAC
filtering and stuff if you click "Advanced" from the top menu.
You can also enable the SNMP agenti from System Tools->SNMP and manage
the router from the command line.
The command line to see all variables is:

 snmpwalk -v 2c -c public 192.168.1.1

"2c" is the SNMP version for the device
"public" is the name of the read-only community.

To get the system description:

 snmpget -v 2c -c public 192.168.1.1 sysDescr.0

It is in the output of the command "snmpwalk".