manage a modem connection

[Édouard Debry <edouard debry gmail com>]

Hello,

I have a "e3372h-153" Huawei 4G USB dongle.

This dongle works with the "huawei_cdc_ncm" kernel driver.

Once connected,  two devices appear : /dev/ttyUSB0 and 
/dev/cdc-wdm1.
These ones are used to talk to the modem itself.

There is also a network interface appearing, which is (I believe)
related to the driver "huawei_cdc_ncm" and the NCM protocol :

wwx001e101f0000: flags=4098<BROADCAST,MULTICAST>  mtu 1500
       ether 00:1e:10:1f:00:00  txqueuelen 1000  (Ethernet)

I am able to connect the modem with "mmcli ...", yet still I have 
to configure
the corresponding network interface in order to access the 
web. But this
interface does not show up with "nmcli device show". I am however 
able to
issue "dhclient wwx001e101f0000" and it works.

I also tried "nm-connection-editor". This one finds the modem 
(gsm) but it seems to
settle a connection through ppp. I would prefer a connection 
through wwx001e101f0000
because it uses the NCM protocol, known to be faster than PPP.

Then, how come that I cannot see and configure wwx001e101f0000 
with nmcli, just like
any other network (wired, wifi) interface ?

Thanks in advance for your kind attention

Regards